Yes, diatomaceous earth (DE) pool filters require regular backwashing, typically every 4-6 weeks or when the pressure gauge reads 8-10 PSI above the clean starting pressure. After backwashing, you must add fresh DE powder to recharge the filter.
A dirty pool filter shows clear warning signs: high pressure gauge readings (8-10 PSI above clean pressure), cloudy or dull water, reduced water flow from return jets, and visibly dirty filter media. Check these indicators weekly to maintain optimal filtration.
Backwash your pool sand filter for 2-3 minutes or until the water in the sight glass runs clear. This typically happens when your pressure gauge reads 8-10 PSI above the clean starting pressure.
