5-micron (nominal) filtration. Fine sediment filtration - sand, dirt, silt, rust particles, and scale particles. Pleated polyester and cellulose fiber blend. High flow rate/low pressure drop capabilities. High dirt-holding capacity. Filter life of up to 3months. Fits Culligan/AMETEK model HD-950 and also fit Omnifilter, Selecto, Flotec, and AMETEK Big Blue heavy-duty filter housings.