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Ecosoft’s 10'' polyphosphate crystal filter contains a mixture of polymeric metaphosphate compounds, the main one being hexametaphosphate (a hexamer of phosphate) which is why they are often referred to as hexametaphosphate crystal filters.As water passes through the filter, the crystals slowly dissolve into it, imparting new properties to the water. Polyphosphate crystals act as dispersants in water and provide protection against the formation of calcium and magnesium deposits (hardness),..