The ideal water filter system includes a sediment filter as the first stage to remove larger particles of dirt or sediment before they can reach and clog your finer filters and appliances. Certified to NSF/ANSI 372 for lead-free materials, the WSPSL-ARJ Series fulfills this role by offering a stainless steel mesh in various micron sizes, allowing you to control what size particles are allowed to pass into your home or following filters. This helps prevent large particles of dirt from clogging any finer filters you may already have in place. It also includes a powerful anti-scale and corrosion agent called Siliphos, a glass-like polyphosphate compound containing Sodium, Calcium, Magnesium, and Silicate, formulated specifically to address water problems.