4 Signs Your Pool Filter Needs a Deep Clean

Pressure spikes again quickly after backwashing If the pressure rises fast after a backwash, the filter media is still fouled with oils, sunscreen, or algae. Backwashing just redistributes the debris instead of removing it.

Sand filters develop channels or coating Sand can get channeled or coated with residue. Use a degreaser or dishwasher detergent (check your manual), let it soak overnight, then backwash again.

Cartridge filters trap fine particles in pleats Pleats trap fine particles that a hose rinse won’t remove. Soak the cartridge in a chemical cleaner or replace it if overdue.

DE filters get caked grids DE filter grids can become caked with calcium or oil. Remove the grids, soak them in acid or degreaser, and scrub gently.