How Much Sand for Pool Filter? — Size Chart by Filter Model
The exact amount of sand your pool filter needs depends on the tank diameter, not the pool size. This guide gives you the right quantity for every major filter size and model, plus a quick bag count calculator.
The Quick Answer: Sand Quantity by Filter Tank Size
The amount of sand your filter needs is determined by the tank diameter — not your pool’s volume, not your pump size.
| Tank Diameter | Sand Required | 50 lb Bags |
|---|---|---|
| 16 inch | 50 lbs | 1 bag |
| 18 inch | 75 lbs | 1.5 bags |
| 19 inch | 100 lbs | 2 bags |
| 21 inch | 150 lbs | 3 bags |
| 24 inch | 200 lbs | 4 bags |
| 27 inch | 300 lbs | 6 bags |
| 30 inch | 350 lbs | 7 bags |
| 36 inch | 500 lbs | 10 bags |
The most important step: check the label on your filter tank. The exact sand requirement is printed on a sticker on the side or back of every filter housing — it overrides any table you find online, including this one. Tank diameters are nominal, and there is variation between manufacturers.
Sand Quantity by Popular Filter Model
| Filter Model | Tank Diameter | Sand Required |
|---|---|---|
| Hayward ProSeries S166T | 16 inch | 50 lbs |
| Hayward ProSeries S180T | 18 inch | 100 lbs |
| Hayward ProSeries S210T | 21 inch | 150 lbs |
| Hayward ProSeries S244T | 24 inch | 200 lbs |
| Hayward ProSeries S270T | 27 inch | 300 lbs |
| Pentair Triton II TR-40 | 19 inch | 100 lbs |
| Pentair Triton II TR-60 | 21 inch | 150 lbs |
| Pentair Triton II TR-100 | 24 inch | 200 lbs |
| Pentair Triton II TR-140 | 27 inch | 300 lbs |
| Intex Krystal Clear 10 inch | 10 inch | 20 lbs |
| Intex Krystal Clear 12 inch | 12 inch | 35 lbs |
If your model is not listed, measure the widest part of the tank with a tape measure or check the owner’s manual.
The Fill Level Rule: 2/3 Full, Not Full
Sand filters should be filled to approximately two-thirds of the tank’s capacity — never to the top.
The upper third of the tank serves as a water reservoir above the sand bed. During the filtration cycle, water enters the top of the filter and pools in this space before being drawn down through the sand. Without this space:
- The filter loads with debris faster (less volume per filtration cycle)
- Backwashing is less effective (the reversed flow cannot agitate the sand properly)
- In extreme cases, the multiport valve cannot seat correctly
Most sand filters have a fill line marked inside the tank. If yours does not, 2/3 full is the correct target.
What Sand to Use
The correct media for virtually all residential pool sand filters is #20 grade silica sand with a grain size of 0.45–0.55 mm. It is sold specifically as “pool filter sand” at pool supply stores and online.
Do not use:
- Play sand (wrong grain size — too fine)
- Construction sand or river sand (contaminated, wrong size)
- Beach sand (irregular grain, organic contamination)
- General-purpose silica sand (check the grain size — many are too coarse)
See our full guide on what type of sand for pool filter for the complete breakdown of media types including ZeoSand and filter glass alternatives.
If You Are Replacing the Sand
When changing sand, you will need the tools and steps in our how to change pool filter sand guide. The most common mistake when replacing sand: not filling the tank halfway with water before adding the new sand. The water cushion prevents the laterals from cracking on impact — a repair that costs more than the sand itself.
Related Guides
- How to Change Pool Filter Sand — full step-by-step replacement procedure
- What Type of Sand for Pool Filter? — #20 silica vs ZeoSand vs filter glass
- How Often to Change Pool Filter Sand? — when replacement is needed
- Sand Filter Complete Guide — all sand filter topics in one place
Frequently Asked Questions
How much sand does a 24-inch pool filter need?
How many bags of sand do I need for my pool filter?
What happens if I put too much sand in my pool filter?
What happens if I put too little sand in my pool filter?
Can I use ZeoSand or filter glass and use less quantity?
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