Stacked Rapid Sand Filtration
Introduction
A vertically stacked filtration system meets many of the AguaClara Project constraints. Both normal filtration and back wash operations are gravity driven and require no electricity. In additon, it is an open system. The required construction materials(PVC pipes, sand, concrete, and rebar) are relatively cheap and abundant in Honduras. Most importantly, sand filtration is proven to consistently lower the effluent NTU standard to below 1 NTU.
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