The Best sand filters for pools of 2023 – Reviewed and Top Rated

After hours researching and comparing all models on the market, we find out the Best sand filters for pools of 2023. Check our ranking below.

2,886 (random number) Reviews Scanned

Rank No. #1

Mystic White II U.S. Silica 1 Pack Premium Sand for Pool Filter Pumps, 50 Lb

High-Quality Filtration: U.S. Silica Mystic White II Pool Filter Sand provides superior filtration for above ground and inground pools; This bag contains 50 pounds of high-purity white silica sand
Convenient Packaging: Also available in packs and bags, making it easy to store and handle; Ideal for use with sand pool filter pumps, ensuring thorough cleaning of pool water
Effective and Reliable: Consistent-sized pool filtration solution captures and removes dirt, dust, leaves, insects, moss, oil, cosmetics, gum, and other debris, ensuring your pool water remains clean
Easy Application: Quality angular-shaped sand maximizes solid entrapment and ensures uniform flow to prevent clogging; Compatible with any standard pool filter system
The U.S. Silica Expertise: For over 100 years, U.S. Silica has led the industrial silica and minerals industry with resilient, reliable, and innovative solutions.

SaleRank No. #2

Palmetto Poolfilter-50 20# Grade – Formulated for All Residential, Commercial Pool Sand Filters, One Size, 50Lb-A

Filtration – Our perfectly sized pool filter sand grabs insects, leaves, dirt, dust, sunscreen oil, hair and other small particles to keep your pool sparkling clean.
Pool Filter Sand – This pool filter sand is specifically designed to meet the standards for all brands of pool filters. We have upgraded our production with new robotics and screening technologies to make the highest quality sand for pool filters. Always follow Manufacturers recommendation FO the amount FO sand to add to your filter.
Sand - Our sand is 100% natural and has No chemicals added. This ensures smooth operation for backwashes of sand pool filters.
Clumping – Our sand will not solidify and not allow clogging and channeling of the sand in the filter. Our sand gives pool filter a smooth operation.
Washed Sand – We wash our silica sand to remove all impurities. Our sand exceeds the requirements of the American Water Works Association for pool filter sand and our sand is packaged in strong heat sealed 6. 5 heavy mil bag.

Rank No. #3

SWIMLINE HYDROTOOLS 12 Inch Pool Sand Filter Pump For Above Ground Inground Intex Bestway Pools | Complete System 1/3 HP (0.3 THP) Horsepower 1980 GPH Pumps | For Pools Up To 8000 Gallons | 71225

{EFFICIENT WATER FILTRATION} Hydrotools sand filters are designed to hold sand at the most effecient position for optimized filtration, consistent performance, and efficient backwashing. Perfectly constructed to efficiently promote the cleanest water quality.
{OVERSIZED CAPACITY} This sand filter features a double reinforced 12 inch molded tank that can hold up to 42 pounds of sand, perfect for pools up to 8000 gallons. Sand can withstand approximately 5 years of use before replacement depending on water chemistry and proper backwashing frequency.
{SILENT BUT POWERFUL} This filtration unit houses a freshly designed 0.3 THP 1980 GPH pump (Model 71206). The pump has been optimized to run on low noise levels & is DOE compliant, making the filtration process a seamless experience for pool owners.
{SIMPLE COMPLETE COMBO} Complete set including the Tank, Pump, Filter Base, 4-Way Multi-Port Valve, 3-Prong Plug & Power Chord, and more. Comes with everything you need out of the box for quick, simple setup and operation.
{MULTI-PORT FILTRATION} Integrated Multi-Port Valve provides quick, easy to understand settings for optimal filtration performance. Settings include: Backwash, Rinse, Filtration, and Winter.

SaleRank No. #4

Intex SX2800 Krystal Clear Sand Filter Pump for Above Ground Pools: 2800 GPH Pump Flow Rate – Improved Circulation and Filtration – Easy Installation – Improved Water Clarity – Easy-to-Clean

HYDROAERATION TECHNOLOGY BY INTEX -– Transforming the Above Ground Pool industry, by bringing revolutionary water aeration benefits such as improved circulation and filtration, improved water clarity, increased negative ions at the water surface
EASY INSTALLATION – Just hook up hoses and plug in! This pump is a must have for any above ground pool up to 17,200 gal (Partial assembly required)
24 HOUR TIMER – The SX2800 has a built-in 24-hour timer with 2 to 12 hour pre-set cycles for automatic operation. The timer adds to the hassle-free experience with maintaining a cleaner pool
2800 GPH PUMP FLOW RATE – Water flow rate at pump (pump capacity): 2,800 gph (10,599 lph); in pool (system flow rate): 2,150 gph (8,138 lph); suitable for INTEX pools up to 17,200 gallons
SAFETY, QUALITY and VALUE – Intex designs, builds, and tests all its products to the highest standards with safety the first order of business; our affordable and innovative products are built to last

Rank No. #5

Bestway Flowclear Sand Filter Pump w/GFCI Plug | 800 Gallon/Hour Flow Rate | Cleans Water for Above Ground Pools

EFFICIENTLY FILTERS POOL WATER: The sand traps dirt and debris in a durable, corrosion-resistant filter tank as a pre-filter strainer basket catches larger debris, such as leaves, hair, and dirt to ensure that the pump lasts many summers of use. Water flows through the pool pump at a flow rate of 800 gallons/hr.
CLEAN, HEALTHY WATER: Our filter comes with the ChemConnect Dispenser, which maintains gentle and skin-friendly water by providing a stable level of chlorine that is evenly dispersed throughout the entire pool.
COST-EFFECTIVE SOLUTION: A sand filter pump uses silica sand instead of a traditional filter cartridge. Those cartridges need to be replaced every 2 weeks while the sand lasts up to 3 years. Sand is not included.
HASSLE-FREE ASSEMBLY: This product arrives pre-assembled for added convenience. A top flange clamp design with 360 degrees rotation s quick and smooth installation.
IDEAL FOR ABOVE GROUND POOLS: Compatible with most 300-4, 200 gallon capacity above ground pools. An adapter is included if the pool valve diameter has a diameter of 1. 25 inches.

Rank No. #6

HTH 67079 Pool Filter Sand Cleaner and Clarifier, 50 lbs, Clear

BENEFITS: Ensures that your sand filter is functioning properly, so you have clean and healthy water in your pool or spa all season long
USE: Follow filter manufacturer instructions for filling; For best results, use with other HTH pool care products
COMPATIBILITY: Great for use with sand filters in pools and spas, including saltwater systems
FEATURES: Medium filter sand; Restores filter efficiency; Pure and perfectly sized
INCLUDES: One 50-lb container of filter sand for your swimming pool or spa water

Rank No. #7

U.S. Silica 50 Pound Mystic White II Non-Corroding Non-Staining Premium Swimming Pool Filter Sand Refill for Even Flow Rate, White (2 Pack)

Features angular-shaped sand that provides maximum entrapment of solids, optimizing your pool filtration abilities ensuring that your pool water is always hygienic
Pool sand filter from U.S Silica effectively removes debris, leaves, moss, oil, cosmetics, gum, and other litter, leaving you a clean and clear pool water
Features a specially-graded formula that stops clogging and ensures a uniform flow rate within the pool filter; Sand filter is carefully screened and graded which reduces problems in the filter
Does not stain or corrode your pool and can be safely disposed of, reducing hassle during pool maintenance; Pool filter sand is inert and odorless, making for a safe and enjoyable swimming experience
U.S. Silica Mystic White II Swimming Pool Filter Sand beautifies your pool for a clear, relaxing atmosphere; 2-Pack 50-pound bags of sand filter; Dimensions (L x W x H): 24 x 15 x 4.5 inches

Rank No. #8

Zeo, Inc ZeoSand-50 ZeoSand Swimming Pool Sand Replacement, Alternative Filter Media, 50 P, White

Replaces sand as a filter media
50 pounds of ZeoSand is equivalent to 100lbs. Of sand
Lasts up to 5 years
Catches more particulate than sand and decreases back wash times
Product Ships as 2 x 25 lb. bags

Rank No. #9

FUNTEKS 3.1 Lbs Pool Filter Balls Eco-Friendly Fiber Filter Media for Swimming Pool Above Ground Pool Hot Tubs Filters Alternative to Sand(Equivalent to 110 Lbs Filter Sand)

Material: 1400g (3.1 Lbs) Fiber filter ball is made of polyester, polypropylene spherical filter and acrylic fiber. Good elasticity, non-toxic, stable. 3.1 Lbs filter ball is equivalent to 110Lbs filter sand.
Powerful: Fast filtration, strong adsorption capacity, long service life and easy operation, it can trap tiny suspended solids that are not easily precipitated and removed and make the swimming pool cleaner.
Service Life: Unlike sand, the filter ball does not block your filter and requires less backwash for maintenance purposes. Lighter, more comfortable and more efficient than traditional sand filter, perfect alternative to sand filter sand, filter glass and other glass media.
Repeated use: It can be cleaned regularly, machine washable, recyclable, very durable and low in loss. ( Tips: Put filter balls in a laundry bag and machine wash)
Widely Applicable: Suitable for swimming pools, aquariums, filter pumps, fish tank,above ground pool, Spa hot tubs and other media.

Rank No. #10

XtremepowerUS 19" Above Inground Swimming Pool Sand Filter System 7-Way Multi-Port Valve Pool Filter up to 24,000 Gallons with Stand

Sand Filter System - The Filter are perfectly engineered to provide optimum flow rates that promotes clean water quality
Dependable Performance - This filter keeps the sand height level to expose water to the maximum sand surface level possible for optimum filtration, consistent performance, and efficient back-washing
Multi-Port Filter - Multi port provides for easy use and quick back-washing (Filter, Backwash, Winter, Re-Circulate, Closed, Rinse and Waste)
Heavy Duty Design - Compact housing for all-weather functionality Impeller designed with brass inserts for long life and superior performance. Each tank is individually tested to ensure quality and reliability. Above ground pool owners can enjoy the same high performance, outstanding operating efficiency, and long-term reliability as inground pool owners
With a threaded connections, a filter base and user's manual. Includes 6-position valve, this tank holds 175lbs of media sand; Overall Dimension: 19"(W) x 19"(L) x 35-1/4"(H) *Pump not included. Pump is Required*

Rank No. #11

MOLVCE Pool Filter Balls 1.5 lbs Equals 55 lbs Pool Filter Sand Reusable Fiber Filter Media Washable Scum Eliminating Sponge Balls Eco-Friendly for Swimming Pool Sand Filters, Aquarium, Fish Tanks

【Filter balls for sand filter systems】Weight: 1.5lbs / 700 g, can replace 55lbs / 25 kg of filter sand; Diameter: 50-60mm; Material: 100% polyethylene, recyclable. We use the lightest material on the market.
【Reusable】The filter ball can be washed and reused, which is environmentally friendly and economical.
【Noticeable Cleanliness】A new generation of filter balls has faster filtration speed and higher adsorption capacity than traditional filter media. It can filter out even the smallest 1 micron dirt particles. Due to the intensive pool care, flocculants are also saved.
【Maintenance】1. If necessary, simply wash with a small amount of washing liquid at 30 ° water temperature. 2. Do not expose to direct sunlight.
【Wide Applications】This filter balls is suitable for filtration of swimming pool and fish tank. It is suitable for filtration of filters, filter barrels, pool, etc., which can effectively filter out fine suspended matter and improve water quality. Suitable for all sand filter systems! Also suitable for sand filter pumps in salt water.

SaleRank No. #12

Moritakk 1.54lbs Pool Filter Ball for Sand Filter Pump for Above Ground Pool,Reusable Eco-Friendly Filter Balls Replace Pool Filter Sand (Equals 50 lbs Pool Filter Sand).…

💦New Upgrade for 2023:Filter balls are a perfect replacement for pool filter sand, longer lifespan, no clogging of the filter, less backwashing for maintenance. Remove tiny suspended solids that are not easy to settle, and the filtration rate performance is higher than other sand filter media
💦High-Quality Material:The filter ball is made of 100% polyester fiber, which has the advantages of high filtration accuracy, high dirt interception capacity, high backwashing cleanliness, and low water consumption. The particle filter material is a brand new filter material.
💦Reusable:The product comes with a mesh bag made of high-quality polyester fiber, which is easy to clean and can be machine washed or hand washed directly with the equipped mesh bag
💦Wide Application:The filter ball is compatible with all kinds of pool filters, including sand filter, cartridge filter and DE filter, also suitable for aquarium and fish tank, lighter and more efficient than filter sand, clear water for you and you happy child swimming
💦Warranty Service:If you have any questions or concerns about this, please contact us and we will reply promptly

Rank No. #13

YIVIKPE 13" Sand Filter with 1/3HP Pump System, Handy 7-Way Valve for Above Ground Pools with Prefilter Pool Pump, 115V, 23FT Cord for Easy Installation, SF04

7 -way valve: Our swimming cleaner on the floor has been designed for optimal cleaning efficiency & with a 7 -position rotating valve easy to operate that will filter, rinse, circulation, recirculation, close & prepare the winter.
Ultra Silent Pool Filtration: The Sandpro Ultra Silent Pool filter system with 25 -foot feed cable has an engine with a high flow & 1/3 horsepower pump (HP), creating maximum energy efficiency & operating with the maximum vacuum power.
Easy to read pressure meter: Our sand filter system has been designed with an easy to read pressure meter & a hair filter basket & large -capacity waste easy to clean with transparent lid.
Designed for swimming pools up to 8,500 gallons above the floor] : The 1/3 HP spare swimming pool filter unit is designed for swimming pools on the floor with capacity for up to 8,500 gallons & requires 45 pounds of pool leafy sand of medium grade (not included).
12 months of post- service: We provide free return & change within 30 days after the firm for urgent delivery. In 12 months, if the product quality problem, we can provide free parts or partial reimbursement according to your use time.

Rank No. #14

RxClear® 19" Inch Sand Filter for Above Ground Pools | 175 lbs. Sand Capacity | Swimming Pool Filters with Valve & Base

Efficient and Easy Operation- from setting up to operation this filter is designed to be efficient and easy to use
Keep Your Pool Clean- designed to handle the filtration needs of modern pools, this filter will keep your pool water clean and sparkling.
Accepts Most Pumps- with a one piece blow molded tank that sits atop a universal base, this filter will accept most pool pumps
Top mount- 6-position, multi-port valve
6' hoses (x2), 3' hose (x1), Required Clamps and Fittings

Rank No. #15

ZUOLUN Pool Filter Balls for Sand Filter Pump: 1.54lbs Pool Filter Ball, Reusable Eco-Friendly Fiber Filter Media for Swimming Pool, Replace Pool Filter Sand (Equals 50 Lbs Pool Filter Sand)

【HIGH-QUALITY MATERIAL】Pool filter balls Made of Polyester, Polypropylene Spherical Filter & Acrylic Fiber, which not only has the advantages of high filtration precision and large sewage interception capacity of fiber filter material, but also has the advantages of high backwash cleaning degree and low water consumption of particle filter material, forming a A brand new filter material.
【WIDE APPLICATION】The pool filter balls suitable for swimming pools, aquariums, fish tanks, filter pumps etc. A perfect replacement for filter sand, filter glass and other media. lighter and more efficient than traditional filter sand, clear water for you and your children to swim happily.
【NEW PRODUCT】More Comfortable and More Efficient than Traditional Sand Filter., Pool filter balls last longer, won't clog filters, and require less backwashing for maintenance. The filter ball can trap tiny suspended solids that are not easy to be removed by sedimentation. Filtration rate is higher than traditional sand filter media.
【REUSABLE】The product comes with a mesh bag made of high-quality polyester fiber. You can wash the pool filter balls in the washing machine with our wearing laundry bag, or you can wash it by hand.
【EASY TO USE】the fiber pool filter balls is easy and convenient for you to use, you just need to put these pool filter media balls in the sand pool filter tank of the swimming pool, which is a nice substitute for filter sand, filter glass and other media, bringing much convenience to you

Rank No. #16

HTH 67074 Filter Sand Care for Swimming Pools, 50 lbs

For use with in-ground or above-ground swimming pool sand filters
Specific for use in all sand filters
Specially formulated
High quality

Rank No. #17

Yescom 12" Sand Filter Pump for Above Ground Pool 4-Way Valve 2640GPH 3/4HP w/ Strainer

[Pool Filtration System]: 12" Sand Filter with 3/4 HP Pump fits for 14x14 ft above-ground swimming pools, designed to draw water from the pool & filter dirt, dust, and other suspended substance, efficiently turning your pool water from cloudy to sparkling clean, enabling hassle-free pool maintenance every swim season
[4 Functions]: Designed with an easy-to-operate 4-position valve, the sand filter provides 4 functions including Backwash, Rinse, Filter, Winter for quickly backwashing the filter, flushing out debris from the filter, purifying the water, and closing water flow to the filter
[High Efficiency]: Filter features flow rate up to 2640 GPH and max. working pressure up to 51 PSI for ensuring fast flowing and reducing filtering time; Meter with precise scales helps you monitor water pressure easily for backwashing
[Durable Construction]: The sand filter tank is made of PP material with 30% glass fiber for providing good rigidity and abrasion resistance; Pump motor with aluminum shell for better rustproofness and heat dispassion, ensuring longer pump life; Includes a strainer basket for filtering leaves
[Easy Assembly]: Includes all accessories for installation, just place the center pipe into the tank and add filter balls inside, then install the control valve with meter and secure the valve with clamp kits and screws

Rank No. #18

Effie Lancelot 3 lbs Pool Filter Balls, Pool Filter Sand Eco-Friendly Filter Media for Swimming Pool and Bath Center Bathtubs, Suitable for All Sand Filter Systems (Equals 100 lbs Pool Filter Sand)

【New High-Efficiency Product】 Pool filter balls provide superior filtration compared to traditional filter sand. Our 3 lb pool filter balls are as effective as 100 lbs of pool filter sand, with powerful filtering capacity, capable of meeting your needs and replacements.
【Premium Filtration】 Pool filter balls are made of polyester, polypropylene ball filter, and acrylic fiber. They not only have the advantages of strong adsorption capacity, fast filtration speed, long service life, reusable use, and low loss, but also have the ability to intercept tiny suspended solids that are not easy to settle and remove, ensuring that your swimming pool remains clean and healthy.
【Eco-Friendly and Energy-Efficient】 Made of 100% recyclable material, the filter balls are reusable many times and easy to clean, making them a cost-effective and eco-friendly choice. The included mesh bag is easy to clean and store. You can wash the filter balls in the washing machine with our included mesh bag or by hand.
【Easy to Clean and Maintain】 Unlike traditional filter sand, our pool filter balls are lightweight and easy to handle, won't clog your filter, and require less backwashing for maintenance purposes. They extend filter life and are a perfect replacement for filter sand and filter glass, saving you time and effort.
【Wide Application】 The filter ball is suitable for sand filter pumps for above-ground swimming pools, aquariums, fish tanks, and other filter pumps. Their high adsorption capacity and filter strength ensure your pool water is crystal clear and free of impurities, allowing you and your family to enjoy clean and clear water.

SaleRank No. #19

VEVOR 3000GPH Sand Filter Pump for Above Ground, 12" Sand Filter with 1/2 HP Pool Pump, Digital Programmer Timer, Filters Combo Set w/ 6-Way Multi-Port Valve, Easy Installation, White

Efficient Performance: Are you ready to enjoy your pool this summer? Our 0.5 HP sand filter pump provides a large water flow of up to 3000 gallons per hour, ensuring efficient water circulation speed. With the ability to cycle the entire pool in a short amount of time, you can enjoy a clean and safe swimming experience.
Multifunction & Intelligent Timing: The sand pump for above ground pools is designed with 5 different functions, giving options to filter, rinse, backwash, waste, and winter modes. Its 24-hour dual-mode intelligent timing function (continuous cycle mode and single cycle mode) makes operation a breeze.
Easy to Maintain and Clean: Our sand filter pump system includes a filter basket to effectively filter out impurities, which can be easily detached and assembled for quick cleaning. With the transparent lid, you can visually observe the internal status for timely maintenance. It's important to note that we recommend using 20# sand for optimal performance.
Durable Motor and Material: Our sand pool pump has a copper wire motor that features overload protection for long-lasting running and extended service life. It's built with reinforced thermoplastic housing, making it portable, corrosion-proof, and ideal for promoting clean water quality all day long.
Meet All Your Pool Needs: VEVOR's pool sand pump is versatile and suitable for both domestic and commercial pools, including courtyard pools, community pools, small water parks, and above-ground pools. The complete set includes a pool pump, sand filter, 6-way multi-port valve, and other necessary accessories for your convenience.

Rank No. #20

Naisidas 1.54lbs Pool Filter Balls for Sand Filter, Pool Filter Media Balls for Swimming Pool Reusable Eco-Friendly Sand Filter Balls Instead of Sand(Equals 50 lbs Pool Filter Sand)

【New Upgrade for 2024】Naisidas Pool Filter Balls Using advanced fiber material, it can provide excellent filtration effect. The filter balls are lightweight and easy to use and can be added to any pool or aquarium filter. They last longer than traditional filter media, require less maintenance, and are reusable, making pool cleaning and maintenance a breeze and giving you more time to enjoy your pool.
【High Efficiency Filtration】Our filter balls provide excellent filtration efficiency, 1.5 pounds of filter ball is equivalent to 50 pounds of filter sand. 3.0 pounds of filter ball is equivalent to 100 pounds of filter sand. Even tiny debris and pollutant particles can be captured, making your pool water as clear as crystal.
【Long-Lasting Durability】Our pool filter balls can withstand heavy use and high pressure to ensure long-lasting durability and reliable performance, and are easy to clean and can be machine washed or hand washed directly with the equipped mesh bag. The high quality filter media can extend the life of the filter and is a perfect substitute for filter sand, filter glass and other media.
【Multipurpose Applications】 Our pool filter balls are compatible with various pool filters, including sand filters, cartridge filters and DE filters, not only for above and underground swimming pools, but also for aquariums and fish tanks, providing excellent filtration performance for a wide range of applications.
【Satisfactory Service】If you have any questions in the process of use, please feel free to contact us, we will reply promptly. Your satisfaction is our top priority.

Last update on 2023-07-31 / Affiliate links / Product Titles, Images, Descriptions from Amazon Product Advertising API

How Do You Buy The Best sand filters for pools?

Do you get stressed out thinking about shopping for a great sand filters for pools? Do doubts keep creeping into your mind? We understand, because we’ve already gone through the whole process of researching sand filters for pools, which is why we have assembled a comprehensive list of the greatest sand filters for pools available in the current market. We’ve also come up with a list of questions that you probably have yourself.

We’ve done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for sand filters for pools that you consider buying. Your questions might include the following:

Is it worth buying an sand filters for pools?
What benefits are there with buying an sand filters for pools?
What factors deserve consideration when shopping for an effective sand filters for pools?
Why is it crucial to invest in any sand filters for pools, much less the best one?
Which sand filters for pools are good in the current market?
Where can you find information like this about sand filters for pools?

We’re convinced that you likely have far more questions than just these regarding sand filters for pools, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for sand filters for pools, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible sand filters for pools. Make sure that you are only using trustworthy and credible websites and sources.

We provide an sand filters for pools buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information. How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available sand filters for pools currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

Brand Value: Every brand of sand filters for pools has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
Features: What bells and whistles matter for an sand filters for pools?
Specifications: How powerful they are can be measured.
Product Value: This simply is how much bang for the buck you get from your sand filters for pools.
Customer Ratings: Number ratings grade sand filters for pools objectively.
Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their sand filters for pools.
Product Quality: You don’t always get what you pay for with an sand filters for pools, sometimes less, and sometimes more.
Product Reliability: How sturdy and durable an sand filters for pools is should be an indication of how long it will work out for you.

We always remember that maintaining sand filters for pools information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding sand filters for pools is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly! We’re here for you all the time. Contact us here. Or You can read more about us to see our vision.

The Best sand filters for pools of 2023 – Reviewed and Top Rated

How Do You Buy The Best sand filters for pools?

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