The Ceramic Pre-Filter is the first stage of filtration for the Santevia Gravity System, intended to remove large sized particles and contaminants from tap water. The smallest microplastics found in tap water are approximately 2.5 microns. The Ceramic Pre-Filter eliminates particles greater than 0.3 micron size. Filters microplastics, rust, bacteria and sediment. Compatible with the Santevia Gravity System.