Whole house backwashing sediment filters utilize a alumina-silicate,crystal,mineral material has surface micro-mineral projections with 0.25 to 10 micron spacing that effectively trap suspended solids in the water stream. A US Water backwashing filter has a dirt-carrying capacity that is three times the amount that a sand filter has. The filter granules physically filter and trap the suspended solids. In addition,the granules remove a wide range of colloidal and soluble,inorganic metallic,contaminants by surface absorption,chemical-binding,charge neutralization,coagulation,reactions and/or ionic,ion-exchange phenomena. If you have sand,silt or solids in your water or your water has a high degree of turbidity,then a backwashing sediment filter is the right choice.