Complete Guide · 12 articles
Pool Sand Filter Guide — How They Work, How to Maintain Them
Pool sand filters are the most common filter type for residential pools. Sand traps particles as small as 20–40 microns. This guide covers everything from choosing the right sand to step-by-step replacement, cleaning, and troubleshooting — based on hands-on experience with the most common filter brands.
Pool Filter Guide Editorial Team
4 FAQs answered
Updated 2025-04-14
All Guides in This Section
12 articles How-To 01
How to Change Pool Filter Sand Complete step-by-step guide including draining, removing old sand, and refilling.
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How-To 02
How Much Sand for Pool Filter? Sand quantity by filter model and tank diameter — with a bag count calculator.
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Guide 03
What Type of Sand for Pool Filter? #20 silica vs ZeoSand vs glass media — which filters better?
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Guide 04
How Often to Change Pool Filter Sand? The 5-year rule explained — and the signs that tell you to change it sooner.
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How-To 05
How to Clean a Pool Sand Filter Chemical cleaning with filter cleaner — when backwashing alone is not enough.
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Guide 06
How a Pool Sand Filter Works What happens inside the tank during filtration and backwashing.
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How-To 07
How to Vacuum a Pool with a Sand Filter Filter vs Waste setting - which to use and why it matters.
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Guide 08
Can You Use Play Sand in a Pool Filter? Short answer: no. Long answer: exactly why - and what to use instead.
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Review 09
Best Pool Filter Sand The top-rated #20 silica sands tested and ranked.
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Review 10
Best Pool Filter Cleaner Sand and cartridge filter cleaners tested - which removes oils best.
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How-To 11
How to Winterize a Pool Sand Filter Sand filter winterization checklist - drain, backwash, store.
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Guide 12
Pool Filter Balls vs Sand Are filter balls better than sand? Weight, filtration, and cost compared.
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Frequently Asked Questions
How often should you change sand in a pool filter?
Pool filter sand should be replaced every 3–5 years under normal use. If your water stays cloudy after backwashing, or your backwash water runs clear immediately (meaning sand has channelled), it is time to change it sooner. Sand loaded with sunscreen, oils, and algaecides loses filtration effectiveness faster than the 5-year guideline.
How much sand does a pool filter need?
Sand quantity depends on your filter tank diameter. A typical 24-inch tank needs 200 lbs (roughly 4 × 50 lb bags). A 27-inch tank needs around 300 lbs. Always check your filter's manual for the exact specification — overfilling prevents the backwash valve from working correctly.
What is the best type of sand for a pool filter?
#20 grade silica sand (0.45–0.55 mm grain size) is the industry standard and the correct media for virtually all residential pool sand filters. Do not use play sand, construction sand, or any sand not specifically labelled as pool filter sand — the wrong grain size allows debris to pass through the laterals.
What does it mean when my sand filter pressure is high?
High pressure (8–10 PSI above your clean baseline) means the filter is loaded with debris and needs to be backwashed. If pressure does not drop after backwashing, the sand may be channelled, clumped with oils, or overdue for replacement. A chemical filter cleaner can break down oil and grease buildup that backwashing cannot remove.