Pool filters work by pumping water through filter media that traps debris, dirt, and contaminants. The three main types are sand filters (use sand to trap particles), cartridge filters (use pleated fabric), and DE filters (use diatomaceous earth powder).
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.
You should never run a sand filter without any filter media as it won't filter water and can damage equipment. However, you can temporarily use alternative media like filter glass, zeolite, or even emergency solutions while waiting for sand replacement.
