Typical rapid gravity filters contain filter tanks made of coated or stainless steel or aluminum. Influent flows fall through the filter and are captured by the underdrain. The filter media removes particles from the water. It usually has 3 layers: anthracite coal, silica sand and gravel.

This approach is effective for removing impurities and uses less cleaning time, lowering cost.

Microorganisms

The project was to remove parasites and other contaminants

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