PENTEK-PD-25-40 is a Polypropylene Filter Cartridge that has enhanced collapse strength and durability. The filter is made from thermally bonded polypropylene microfibers that increase its filtration efficiency. This filter is designed to to remove particles down to 25 microns very effectively; this includes contaminants like sediment, sand, dirt, silt, rust, and scale particles that would otherwise build up in your pipes and equipment causing lowered efficiency and even premature failure. Get your whole house filter today and enjoy the benefits of having filtered water and peace of mind.