Most expensive; requires adding DE powder after backwashing. 2. Determine the Correct Size
Pool Filter Sizing - How to Choose the Right Size - Leslie's Pool Supplies buy pool filter
Premium filtration; catches tiny particles for "sparkling" water. Most expensive; requires adding DE powder after backwashing
Sand (~4.9 sq ft), Cartridge (400–500 sq ft), DE (60 sq ft). 3. Key Compatibility Checks Cartridge (400–500 sq ft)
Your filter's flow rate (GPM) must be equal to or higher than your pump's output. For example, a 20,000-gallon pool with a pump turnover of 42 GPM requires a filter rated for at least 43 GPM. Capacity Chart:
For a rectangular pool, use: Length × Width × Average Depth × 7.5 = Total Gallons .