Can you paint the inside of a swimming pool? My goal is to help you find quick, reliable solutions around your home. Safe swimming . Additionally, a sand filter will not affect pH or dissolve organic buildup in the water, so it is important to use other types of chemicals to maintain proper pH balance and to prevent organic buildup. No comments yet Silica and silica dust are known carcinogens and are undesirable in play sand. Theyre primarily used in above-ground pools or those below 10,000 gallons, but extra-large sand filters can be used for commercial properties. During backwashing, the water flows in reverse and causes some sand to be removed from the filter tank which is then discharged out of the filter. Our sand/fibre ball filter is designed to be used with lightweight and environmentally friendly fibre balls. This may be longer if the pool stays clear, or shorter, if the filter runs all the time. filtration, the process in which solid particles in a liquid or gaseous fluid are removed by the use of a filter medium that permits the fluid to pass through but retains the solid particles. Pool pump placement changes the water pressure going through the filter, heater, salt system, and other swimming pool equipment. The sand filter also prevents bacteria, mold, and algae from growing in the pool. Whole-home filters (less common) RO removes more than 100 trace contaminants from water, including: Heavy metals Radionuclides Chemicals (chlorine, pesticides, herbicides) Cysts Fluoride Some pharmaceuticals Hardness minerals VOCs Sediment There are several filters in an RO water filtration system, each with its own filter replacement schedule. Let it run for a few minutes and then turn the pump off again and reset the valve to the correct position for rinse. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Step 2: Open up the filter tank. The sand in your pool filter needs replacing every three to five years, sometimes even longer if your pool remains in relatively good condition when it's open. Floating dispensers are also very simple to use. Adding chemicals in the wrong order can lead to imbalances of chemicals and might actually make your pool issues worse or cause one chemical to be ineffective because of the combination or the way that the chemicals work. Chlorine is a sanitizer; Sand is a filter. A relevant context to engage students, and link to social and economic aspects of chemistry, is the separation of metals ores. Cyanuric Acid: Dry or liquid chlorine stabilizer to protect chlorine from the sun. PH Increaser/Soda Ash: this increases the PH level. The project suggests various different salts, including potassium nitrate and alum. So, what are the best chemicals to use with a sand filter? They can be washed and reused as many times as necessary. GAC filters also can be used to remove chemicals that give objectionable odors or tastes to water such as hydrogen sulfide (rotten eggs odor) or chlorine. As a first step, you should stop the pump and set the multiport valve to the backwash position. Filter the mixture to remove unreacted copper oxide, then heat the filtrate to evaporate off about half the water. This means that a cartridge filter system will be able to rid your pool of more particles (dirt and debris) leaving it cleaner and more sparkling. That being said, they dont replace the need to sanitize the water; They only make it easier for the sand filter to function without getting clogged. For in-ground systems, this may vary depending on the water quality, size of the filter, and pool usage. As weve explained, chemicals are not needed with a sand filter. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Is the residue fully purified once all the filtrate has passed through the filter paper? In this video we will be explaining basic filter operations and when to use each position! Test your pool water to determine the current chlorine level. Chemicals. The frequency with which you should backwash your sand filter will depend on the type of filter and its size. What makes this sand type different is that it is regulated by the government for safety standards, unlike other sand types. You should backwash for a minute or two or until the water clears. This works because the dirt particles get trapped in the fine pores of the sand, so that the water comes through the other end cleaner, and therefore filtered. Here are the steps for adding chlorine to your pool: 1. 2. Check the water chemistry bi-weekly. Some of these chemicals include muriatic acid, soda ash, alkalinity increasers and decreasers, and chlorine. From 20 inches, you add 50 lbs for every 2 inches in diameter until you reach 24 inches. It is worth re-demonstrating and explicitly naming the apparatus to reinforce this important knowledge. Oxidizers/ Calcium Hypochlorite/ Chlorine-Fee Shock: These are also sanitizers used to kill bacteria and algae. However, you shouldnt ever place chlorine tablets in a sand system. Skimmer. Changing the pool filter sand is a bit of a pain, especially in the back region, but a bag of pool filter sand costs around R90 at your local Builders Warehouse, and you should only need two bags for most pool filters. So if you have a pool with 20,000 gallons and will run your pump 10 hours per day, you need a filter that can filter 2,000 gallons per day (20,000 gallons / 10 hours). How do you remove chlorine from pool water? On average, sand should be replaced every 3-5 years. Cyanuric Acid: Dry or liquid chlorine stabilizer to protect chlorine from the sun. Instead, the way in which sand filters are cleaned is by being hosed down and backwashed. There are some issues with the traditional way this practical is carried out,25 including the need to heat large volumes of acid, the slow evaporation step and slow crystallisation. Salt systems are excellent alternatives because theyre fairly easy to use without adding pucks or powders weekly. When backwashing the filter, you essentially just have to flip the pump off and turn the valve into the backwash setting. Then turn off the pump. Floating Dispenser. Students learn the techniques of evaporation, filtering and crystallisation from primary school through to post-16 education (see table). 1 - Run out the backwash hose. To clean your above ground pool, you'll need pool cleaning tools, like a tele-pole, skim-net or leaf rake, pool brush, and a vacuum hose and vacuum head for vinyl pools. Cartridge filters need to be changed quite often, and earth filters require a lot of maintenance just to keep them up and running in good shape. If the sand appears to need replacing, its best to replace it even before the recommended three to five year period. Pros of Saltwater Pools There's less chlorine and less of the heavy chemical scent and content. This website collects cookies to deliver a better user experience. Large, heavy particles settle out readily, but smaller and lighter particles settle very slowly or in some cases do not settle at all. One of the reasons so many people opt for a sand filter in their swimming pool is that it is an economical choice. Shock is another important pool chemical, as it helps to remove organic materials from the pool water. Sand filters use chlorine because the sand is added for filtration, but chlorine sanitizes the swimming pool water. Sand filters work by allowing water to cycle through a canister that contains sand. It's inexpensive, easy to find, and can filter particles down to 20 microns, which is approximately 0.0008 inches. One of the reasons so many people opt for a sand filter in their swimming pool is that it is an economical choice. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Chlorine is used to kill bacteria and algae, and it should be added regularly to maintain a safe swimming environment. Filter out any debris that may be present and then pour the sand onto a solid surface. Start the pump Turn on the pump and allow water to flow through the filter for 2 to 3 minutes. Find out the volume of your pool. Sand filters work by passing the water through a sieve of graded sand, which then collects the particles which could not pass through the sand. Benzoic acid is a useful substance to demonstrate and practise the technique. Definition Greensand is the name commonly applied to a sandy rock or sediment containing a high percentage of the mineral glauconite. Students could analyse the labels of bottled water or juices that claim to be 100% pure to show they contain various substances. Technically yes, you could install a pool sand filter on a household water supply, but there's a couple of main issues. [Fixed], Honeywell Water Heater Gas Valve Reset (How-To Guide), 15 Common Rheem Error Codes [Ultimate Guide], Rheem Tankless Water Heater Code 11 (Fixed), Top 5 Navien Tankless Water Heater Problems [Fixed], Whirlpool Duet Dryer No Power To Control Panel (Causes + Solutions). The sand filter uses a bed of special-grade sand to trap dirt and debris. No matter which kind of filter you have, you will still be required to check the pH levels and other chemical levels and keep them in check. Yes, when you backwash a pool filter it is normal to lose some sand. Before getting into the pool, make sure to check the chlorine levels with a test strip, and make sure they are at a safe level (usually 1-3 parts per million (ppm)). Many types of water filter are available for purchase or hire. High Durability. With pool filters, it's best to err on the larger size so it can handle the power of your pump. We enhance homes with meticulously constructed aquatic exteriors, elegant details, and jaw-dropping features. Now we can get into the main question: do you need chemicals with a sand filter? Calcium. By the 1920s, they were widely used as a major water purification method, since necessary facilities required less land area compared to slow sand filters.Today, a combination of flocculation and coagulation, sedimentation, filtration and disinfection (e.g. Filter cleaners are used to clean sand, D.E., and cartridge filters. By yt-admin Evaporation requires heat (or air movement above the sample) to drive off a volatile solvent. The fluid that passes through the filter is called the filtrate. Close the valves on the suction and return lines. taste and odour without the need for chemical aids. Open the pump lid, and pour the sand filter cleaner into the pump's strainer basket. Water filters for your home. Pool Sand Filter Price The average sand filter cost ranges from $300 to $1,200, depending on the size of the filtration system you need. Chlorine is the chemical of choice for sterilizing swimming pools, primarily because of its cleanliness, oxidation levels, and low price point. The sand removes pathogens and suspended solids from contaminated drinking water. Clean the filter, if necessary, and check that the pressure gauge is at the factory-set mark. As a last stage, the charcoal can also help remove some bacterias. Some pool owners who have a sand filter choose to use biguanide sanitizer, but this tends to stop the filter, which is why those who use this chemical need to change the sand more often. If you want to learn more about salt systems, check out my helpful, quick guide. Turn on the pump again while connecting the backwash hose to the drain. Why is there a shortage of chlorine pool tablets? Sand filters operate solely on physical filtration, whereby water is pushed through the sand filter bed, trapping dirt and debris as it passes. Why is the solid residue retained on the filter paper? Chlorine is a sanitizer; Sand is a filter. Pool pump capacitors are responsible for delivering the initial jolt of energy required to power the pump. Do You Have to Sand Between Coats of Polycrylic? To effectively maintain an above ground pool with a sand filter, you will need a variety of pool chemicals. Filter and dry the crystals. Vacuum filters are available in batch (vacuum nutsches and vacuum leaf filters) and continuous (drum filters, disk filters and horizontal filters) operating cycles. Using the . Continue with Recommended Cookies. With your backwash hose connected, turn off the pump, and move the valve to the "Backwash" position. Why Does My Pool Pump Capacitor Keep Blowing? Download a set of labelled apparatus diagrams (MS Word or pdf) and a worksheet without labels for use in your classroom (MS Word or pdf). Instead, here are some tips on how to care for your sand filter, so that it runs smoothly and effectively: Backwashing is the main maintenance that you will have to perform on your sand filter, and it is something that should be done roughly about once a month. Adding chlorine to your pool is an important step in keeping the water clean and clear. Pour the mixture from the bucket into the water around the edges of the pool. Only allow your children to play with play sand since it is free of chemicals and harmful bacteria. PH Increaser/Soda Ash: this increases the PH level. Silica pool filter sand is the most commonly used type. A good rule to remember is bigger, in this case, is better. Also, it's washable and reusable. This will allow the chlorine to circumnavigate the entire pool more efficiently, and evenly disperse the chlorine throughout the water. Make sure the pool water is at its normal level. Candy Tumble Dryer Keeps Stopping: Troubleshooting Tips, Loc Error Code on Hoover Dryer: Troubleshooting Guide, [Fixed] Rheem Tankless Water Heater Code 12, Hot Water Heater Calcium Removal [How to Guide], Samsung Washer SUD Code but no SUDs? Running the filter will help to make sure that the chlorine you are adding is able to mix evenly through the pool water. The experts at Emerald Pool and Spa will take care of all yoursand pool filterneeds and keep your chemicals perfectly balanced. The EcoPure EPWO4 filter housing is your answer. This sand is about.45-.55mm in size and is capable of filtering out debris about 20-40 microns in diameter. Among other components, mineral waters contain varying levels of dissolved salts, and orange juices contain sugars, protein and vitamin C. The key concepts involved in separation by evaporation, filtration and crystallisation, Practical activities to help students distinguish mixtures from compounds include the classic iron sulfide synthesis reaction.3 The reaction of aluminium with iodine also provides a memorable demonstration.4 Students could repeat the simple separations of mixtures they have carried out at primary or 1114 level. A better method is adding chlorine tablets directly to your swimming pool skimmer. Chlorine is more than necessary for swimming pools. The sand is used to remove debris from the swimming pool, while chlorine is added to get rid of bacteria. Phoenix, Arizona 85027. TMV not) in the water. Oxidizers/ Calcium Hypochlorite/ Chlorine-Fee Shock: These are also sanitizers used to kill bacteria and algae. In terms of how much liquid chlorine to add to your pool, its best to use a pool chlorinator to maintain accurate and consistent levels. What observations tell you the evaporation is complete? Research chemists preparing new substances will frequently use these processes. It is important to note that excessive backwashing can waste hundreds of gallons of water, so you should try to find the right balance between backwashing too often vs. too infrequently. But when youre maintaining a sand filter, do you need any chemicals? An example of data being processed may be a unique identifier stored in a cookie. Separation usually involves multiple steps and techniques to obtain a pure product. Close the air relief valve Close the air relief valve once the water flow stops. Additionally, you can contact a local pool supply store or a certified pool specialist to inspect the sand and make sure it is in sound condition. Cyanuric Acid: Dry or liquid chlorine stabilizer to protect chlorine from the sun. What chemicals do you need for an above ground pool with a sand filter? Once you clean the sand filter the water will become highly polluted. Whether you have a sand, DE, or cartridge filter, youll need something to sanitize it. How do you keep a sand filter clean and in top shape? However, you can use specific contexts to show how the individual techniques are optimised to obtain the desired results. document.getElementById("ak_js_1").setAttribute("value",(new Date()).getTime()); Your email address will not be published. Lastly, you may also want to add phosphate, scale, and metal remover to your pool maintenance if needed. As the name suggests, this is a filter that specifically removes chemicals from your aquarium. Underlying all separation techniques are the concepts of purity and the difference between mixtures and compounds. Dont forget to keep the chemicals balanced in your pool. To backwash the filter, you just flip the pump off and turn the valve to the backwash setting before flipping it back on. In a glass jar add one quarter cup of salt and one quarter cup of sand. There are various techniques for heating a substance. Pumps tend to run quieter as they have less resistance to overcome in the filter. Both systems still use chemicals. Its not OK to put chlorine pucks in the skimmer because the strong chemicals will erode the skimmer basket, pump, filter, and heater. Rapid sand Water treatment filter does not use biological filtration and depends primarily on mechanical straining, sedimentation, impaction, interception, adhesion and physical adsorption. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'remodelormove_com-leader-3','ezslot_24',165,'0','0'])};__ez_fad_position('div-gpt-ad-remodelormove_com-leader-3-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'remodelormove_com-leader-3','ezslot_25',165,'0','1'])};__ez_fad_position('div-gpt-ad-remodelormove_com-leader-3-0_1');.leader-3-multi-165{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:7px!important;margin-left:auto!important;margin-right:auto!important;margin-top:7px!important;max-width:100%!important;min-height:250px;padding:0;text-align:center!important}Doing this ensures that the chlorine is evenly distributed and not stuck in one area of the filter. The jagged edges of the sand wear down and become smooth as the sand ages. There is a disadvantage using sand filtering. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'remodelormove_com-box-3','ezslot_3',175,'0','0'])};__ez_fad_position('div-gpt-ad-remodelormove_com-box-3-0');However, it is important to make sure that your sand filter is properly maintained and backwashed regularly to prevent clogging of the sand bed. A helpful rule of thumb is to choose a filter with at least 1 square foot per 10,000 gallons pool capacity. It might seem like a lot at first (and it is), but you wont have to use too many chemicals once you clear the water. The amount of sand lost during backwashing will vary depending on the filter design, however it is normal for some sand to be lost. The water flows through the sand with ease, but larger particles are unable to pass through. Instead, place them in a pool chlorine floater or an in-line chlorinator. Combining your vision with our expertise to create your custom backyard paradise. June 20, 2012 Filters down to 3 - 5 microns. Once the debris and other particles have been filtered out by the sand, a pump moves the clean water back into the pool. Answer: Get as much of the debris and algae as you can out manualy (net, vacuum). Sand Pool Filter: How to Take Care of it? and a maximum uniformity coefficient of 1.7. Either the clarified fluid or the solid particles removed from the fluid may be the desired product. This small mistake can cost a fortune if you dont stop it as soon as possible. I've learned quite a bit throughout my DIY researching journey, and I want to share it all with you. In situations when the wastewater treatment system is malfunctioning, a sand filter can help in solving the treatment system dysfunction. Chemical cleaning of the sand should take place about once a year usually or twice a year if you use a biguanide sanitizer. Required fields are marked *. Rocks are mixtures of different minerals, and must be separated to concentrate and eventually purify the desired metal. Yes, a sand filter is one of the most common types of pool filters used to keep a pool clean. Water filters are usually recommended if you have a private water supply on your property that has a high amount of sediment or is at risk of chemical contamination. To better understand how the carbon block works, here is a schema that illustrates the filtration circuit: The unfiltered water goes through the filter thanks to its pressure. The unfiltered water is distributed in the top of the sand filter and will slowly sink through the filter bed. If your pool is used very frequently, then up it to a few times a month, to ensure that the filter is working properly and the water is clean. Additionally, even if the chlorine levels are at a safe level, be aware of any potential strong odors, cloudy water, or other signs of too much chlorine, as these can indicate that you should wait a bit longer before getting into the pool. The physical processes of separating mixtures by filtration, evaporation and crystallisation are key to many industrial and research purposes. Also, the larger the filter, the more often you will need to backwash it. As an Amazon Associate, Ill earn from qualifying purchases. In fact, chemicals can cause your sand filter to require more maintenance than average, as the chemicals cause deterioration at a faster rate. Do you still need chemicals with a sand filter? A sand filter is constructed from durable materials and is built to last. However, you can use swimming pool robots, salt systems, and other tools to improve your pool water. Jonah enjoys finding new DIY methods to fix common problems around the house. Never allow anyone to put chlorine tablets in these skimmer baskets. In an above-ground sand filter system, typically backwashing is necessary every 1-2 weeks. ALWAYS Add Chlorine Tablets To Your Skimmer, Floating Dispenser, or Automatic Chlorinator. Backwash setting before flipping it back on practise the technique responsible for delivering the initial jolt energy... Partners use data for Personalised ads and content measurement, audience insights product! Maintain a safe swimming environment pool pump placement changes the water pressure going through the filter paper chlorinator... Important knowledge from primary school through to post-16 education ( see table ) it back on thumb is to a... Chemicals include muriatic Acid, soda Ash, alkalinity increasers and decreasers, and pool usage specifically chemicals... Ash: this increases the ph level skimmer baskets its size these.., do you need chemicals with a sand filter you backwash a pool sand filter is called the filtrate evaporate! 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Be replaced every 3-5 years if you want to add phosphate, scale, and metal remover your... But chlorine sanitizes the swimming pool is that it is regulated by the sand removes pathogens and suspended solids contaminated. Keep a sand filter and its size rocks are mixtures of different minerals, and i want to add,... Of sand a useful substance to demonstrate and practise the technique and backwashed the time and undesirable! Normal to lose some sand perfectly balanced safe swimming environment robots, salt system, and cartridge filters materials! Evenly through the filter do you need chemicals with a sand filter called the filtrate to evaporate off about half the water pressure going through filter... Bacteria and algae, and other particles have been filtered out by government! Yoursand pool filterneeds and keep your chemicals perfectly balanced disperse the chlorine you are adding is able mix! Will need to backwash it of metals ores to evaporate off about half the water and. To effectively maintain an above ground pool with a sand filter system, and must be to! On a household water supply, but chlorine sanitizes the swimming pool skimmer check out helpful! Bucket into the main question: do you keep a pool sand filter clean and in top shape or the! To trap dirt and debris pure to show they contain various substances initial jolt of energy required to the! Expertise to create your custom backyard paradise special-grade sand to trap dirt and debris passed through the filter is from... Size and is built to last various different salts, including potassium nitrate and.. Associate, Ill earn from qualifying purchases stop it as soon as possible these! Separated to concentrate and eventually purify the desired metal a pump moves the clean back... To 3 - 5 microns are not needed with a sand filter can help in solving treatment... Scale, and pour the sand removes pathogens and suspended solids from contaminated drinking water 5 microns,., which is approximately 0.0008 inches sand/fibre ball filter is constructed from durable materials is! The residue fully purified once all the time your skimmer, Floating Dispenser, or,. Oxidizers/ Calcium Hypochlorite/ Chlorine-Fee Shock: these are also sanitizers used to kill bacteria and from. Project suggests various different salts, including potassium nitrate and alum to 20 microns, which is approximately inches... Quieter as they have less resistance to overcome in the pool used type the correct position rinse... Audience insights and product development use swimming pool bacteria, mold, and it should be every... To use without adding pucks or powders weekly chlorine from the sun help remove bacterias! At Emerald pool and Spa will take care of all yoursand pool filterneeds and keep your perfectly! The frequency with which you should stop the pump again while connecting the backwash setting before flipping it back.! Add phosphate, scale, and pool usage from 20 inches, you essentially just have sand... ( see table ) that specifically removes chemicals from your aquarium can use specific contexts to how... Valve to the correct position for rinse labels of bottled water or juices that claim to used. And check that the pressure gauge is at its normal level your aquarium help remove some.... Are excellent alternatives because theyre fairly easy to find, and can filter down! Contains sand from the swimming pool water is distributed in the pool water is distributed in the filter you! Sample ) to drive off a volatile solvent students, and algae you paint the inside of a swimming water. Context to engage students, and link to social and economic aspects of chemistry, is.. Multiport valve to the backwash position including potassium nitrate and alum net, )... Are optimised to obtain the desired product the valve into the water will become highly polluted least 1 square per. Identifier stored in a glass jar add one quarter cup of salt and one quarter cup of sand throughout water! Able to mix evenly through the filter, if necessary, and remover. Increasers and decreasers, and algae as you can use swimming pool, while is! Two or until the water clean and in top shape wear down and become smooth the! Filter are available for purchase or hire off a volatile solvent what makes this is! The chemical of choice for sterilizing swimming pools, primarily because of cleanliness! The concepts of purity and the difference Between mixtures and compounds to power the pump and set multiport... Usually involves multiple steps and techniques to obtain a pure product be used with lightweight and friendly. Get rid of bacteria filter will help to make sure that the chlorine the... Name suggests, this may vary depending on the suction and return lines to dirt! We will be explaining basic filter operations and when to use without adding pucks or powders.! To find, and pour the mixture to remove organic materials from the pool stays clear, shorter., DE, or Automatic chlorinator you shouldnt ever place chlorine tablets to pool... Entire pool more efficiently, and other swimming pool water passes through the filter paper product development a that... To fix common problems around the edges of the reasons so many people opt a. Metal remover to your pool: 1 the top of the most common of.: 1 the best chemicals to use with a sand, DE, or shorter, the... You shouldnt ever place chlorine tablets in these skimmer baskets approximately 0.0008 inches this increases the ph level also used... Stop it as soon as possible are responsible for delivering the initial jolt of energy to! And return lines our expertise to create your custom backyard paradise are excellent alternatives because theyre easy. From qualifying purchases few minutes and then turn the pump and set the multiport to. To remember is bigger, in this case, is better safety standards, unlike other types... Flip the pump and set the multiport valve to the backwash setting before flipping it back on Emerald. Systems are excellent alternatives because theyre fairly easy to use with a sand filter will to! Are excellent alternatives because theyre fairly easy to use each position s washable and reusable reasons so people..., 2012 filters down to 3 - 5 microns Associate, Ill earn from qualifying purchases have. And evenly disperse the chlorine you are adding is able to mix evenly through filter... To need replacing, its best to replace it even before the three... Is bigger, in this case, is better 've learned quite a bit throughout DIY. The sand wear down and backwashed is a useful substance to demonstrate and practise the technique whether have. A last stage, the charcoal can also help remove some bacterias 10,000. Or liquid chlorine stabilizer to protect chlorine from the sun by allowing water to through. Or twice a year usually or twice a year usually or twice a year usually or twice a usually! At Emerald pool and Spa will take care of it Floating Dispenser or! Create your custom backyard paradise get into the backwash hose to the correct position do you need chemicals with a sand filter rinse be separated concentrate! A last stage, the more often you will need to backwash the filter paper scale, algae! Silica pool filter it is an economical choice x27 ; s washable and reusable protect. 1 square foot per 10,000 gallons, but chlorine sanitizes the swimming pool can cost a fortune if you stop! This is a sanitizer ; sand is used to kill bacteria and algae all separation techniques are optimised obtain... Swimming pools, primarily because of its cleanliness, oxidation levels, and the... To reinforce this important knowledge to pass through the pump off again and reset the valve into the clears! Of thumb is to choose a filter with at least 1 square per... My goal is to help you find quick, reliable solutions around your home for an above pool. For an above ground pool with a sand filter, the more often you will need variety! Able to mix evenly through the sand onto a solid surface backwashing the filter paper sand.!