Flux Calcined DE Type 501 CAS 68855‑54‑9 is pool‑grade flux‑calcined diatomite filter media. Its rigid porous structure builds even filter bed inside DE pool filter tank. It efficiently captures fine contaminants including dust, suspended solids and algae spores from circulating pool water. It maintains good water flow rate without frequent clogging. Low impurity content, safe for swimming‑pool water circulation system.

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