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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 . buy pool filter

Premium filtration; catches tiny particles for "sparkling" water. Your filter's flow rate (GPM) must be equal

The three main types vary by their filtration precision (measured in microns) and maintenance needs. Filtration Level 20–40 microns Budget-friendly; low maintenance; lasts 5–8 years. Least precise; requires backwashing (wastes water). Cartridge 10–15 microns No backwashing; easier to install for above-ground pools. Cartridges need replacing every 1–2 years. D.E. (Diatomaceous Earth) 1–5 microns lasts 5–8 years. Least precise