Sand, Cartridge or DE filters?
Individual cartridges must be removed, sprayed and soaked when the pressure gauge reads 10 psi over the normal level. Use a good cleaning agent such as Suncoast Spray & Rinse pool filter cleaner or Suncoast Cartridge Cleaner to remove the scale and oils that impede filtration. 3. Clearest Water: What is a Diatomaceous Earth Filter?