Choosing the Right Pool Filter: Cartridge, Sand, or D.E.?

A properly sized filter is non-negotiable for clean pool water. Filter size (GPM) = Pool gallons ÷ 480 (for 8-hour turnover). The pump must match this flow rate. Larger filters run at lower pressure and need less frequent cleaning.

Three Filter Types Compared

Cartridge Filters

Best for: Small to medium pools.
How they work: Pleated polyester cartridges trap debris. Clean by hosing; replace every 2–4 years.
Pros: Easy maintenance, good filtration.
Cons: Large replacement cartridges are costly.

Sand Filters

Best for: Medium to large pools.
How they work: Water filters down through #20 silica sand; backwashing cleans it.
Pros: Low ongoing cost (sand lasts 5–10+ years), simple.
Cons: Less fine filtration than cartridge or D.E.

D.E. (Diatomaceous Earth) Filters

Best for: Medium to large pools demanding polished water.
How they work: D.E. powder coats grids, filtering to 3–5 microns.
Pros: Finest water clarity.
Cons: Highest upfront cost; medium maintenance expense; requires D.E. replenishment after backwash.

Key Takeaway

Match filter type to pool size, budget, and water quality expectations. Hayward filters (available at MyPool.com) are industry leaders for reliability and performance.