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• Rainfresh Commercial Greensand Filter

Commercial greensand filters remove Iron and Manganese that can cause staining and sludge formation in concentrations as low as 0.3 PPM and 0.05 PPM respectively. Hydrogen Sulphide, in concentrations as low as 1.0 PPM, causes an offensive rotten-egg odour. Rainfresh Commercial Greensand filters are designed to remove iron, manganese and hydrogen sulphide by oxidation and filtration using the oxidant properties of Manganese Greensand, a modified glauconitic greensand that is capable of reducing iron, manganese and hydrogen sulphide from water through oxidation and filtration. Soluble iron and manganese are oxidized and precipitated by contact with higher oxides of manganese on the greensand granules. Hydrogen sulphide is reduced by oxidation to an insoluble sulphur precipitate. Precipitates are then filtered and removed by back-washing. When the oxidizing capacity power of the Manganese Greensand bed is exhausted, the bed has to be regenerated with a weak potassium permanganate (KMnO₄) solution (1½ to 2 ounces of potassium permanganate, in solution, per cubic foot of media).

Commercial Greensand Filters can be used for resorts, campgrounds, motels etc, and even small municipal applications.

Residential Greensand filters are also available.

Following models can be installed in duplex or triplex parallel configuration for higher flow rates. In these configurations, the main control valve is linked by a data cable to the rest of the valves and controls the backwash and sequential flow/backwash configuration for all units.

Models and specifications for commercial greensand filters