Filtralite P is a fine grained filter material, with a large surface area and a high capacity for phosphorus removal. maxit AS has developed this special product using clays and natural additives. The phosphorus is removed by both precipitation at high pH and physico-chemical attraction and bindings. Phosphorus is settled and captured in the filter. In general high P-removal is not obtained in natural treatment systems like constructed wetlands and sandfilters with ordinary sand and gravel as filtermedia. However, by choosing a filtermedia that is manufactured to have large P-sorption capacity like Filtralite P, high phosphorus removal can be obtained.
Filter bed systems may also be built using for instance Filtralite NR 2-4 in the filter bed. The capacity for phosphorus removal will be lower than when Filtralite P is used, but the ammonium removal capacity will in most cases be higher. This can serve as an alternative solution in less sensitive areas.
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