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

Sand (~3.0 sq ft), Cartridge (100–200 sq ft), DE (36 sq ft).

Pool Filter Sizing - How to Choose the Right Size - Leslie's Pool Supplies

Premium filtration; catches tiny particles for "sparkling" water.

Sand (~4.9 sq ft), Cartridge (400–500 sq ft), DE (60 sq ft). 3. Key Compatibility Checks