Birm: Efficient, Economic Iron/Manganese Removal
Calcite (Crushed marble) Density (lb/ft³): 100 Bed depth (inches): 24-30 Service flow (gpm/ft²): 2-6 Backwash flow (gpm/ft²): 10-12 Calcite is crushed marble. It is naturally occurring calcium carbonate. It is used to raise the pH of acidic water. Since it is dissolved only in acidic water, it is self-limiting.
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