Crystal-clear, clean, and pleasant water starts with proper filtration. A sand filter is an essential piece of equipment to maintain the water quality of your pool throughout the swimming season. But it needs to be properly sized!
This guide will help you choose the right sand filter based on the volume of your pool, whether it’s above-ground or in-ground. A correctly sized filter optimizes system efficiency, reduces maintenance, and ensures consistently enjoyable swimming.
Why Is Filter Size Important?
A filter that’s too small will constantly be overloaded, resulting in cloudy water, algae buildup, and premature wear on your system. On the other hand, a well-sized filter offers better filtration performance, reduces backwash frequency, and extends equipment life.
Recommended Filter Size by Pool Volume
For Above-Ground Pools
| Pool Type | Pool Size (Liters) | Minimum Filter Size |
| Above-ground | 15' Round (21,600 liters) | 19" |
| Above-ground | 18' Round (31,200 liters) | 19" |
| Above-ground | 21' Round (42,400 liters) | 21" |
| Above-ground | 24' Round (55,200 liters) | 21" |
| Above-ground | 27' Round (70,000 liters) | 24" |
| Above-ground | 30' Round (86,400 liters) | 24" |
For In-Ground Pools
| Pool Type | Pool Size (Liters) | Minimum Filter Size |
| In-ground | 12' x 24' (32,628 liters) | 19" |
| In-ground | 14' x 28' (44,391 liters) | 21" |
| In-ground | 16' x 32' (58,003 liters) | 24" |
| In-ground | 18' x 36' (73,487 liters) | 24" |
| In-ground | 20' x 40' (90,847 liters) | 25" |
* Figures are for reference only.
* Above-ground pool: estimate based on a depth of 52".
* In-ground pool: estimate based on a depth of 48".
Need a Hand?
Our Trévi experts are here to help you choose the right sand filter based on your pool, your swimming habits, and your budget. Visit us in-store or online to discover our most reliable and high-performance models.