The 7 Best Pool Filters to Keep Your Water Clean and Clear
The three types of pool filter media are cartridge, sand, and diatomaceous earth, or DE. Cartridge filters trap and collect ...
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Division of Environmental Health
if a separate building for showers and/or toilets are associated with the pool or spa OR if the pool backwash discharges to a subsurface system. For existing systems installed after 1974, check with ...