Series 7000 Fill-Rite Pump Filters Keep your engines running their best by using Pump Filters from Fill-Rite. Hydrosorb Filters (water absorbing) help to contain water or microbial contamination, conditions visible through obvious discoloration or the presence of fungi in the fuel. Particulate Filters are suited to handle contamination problems caused by dirt, silt and corrosion. They may be used with alcohol and alcohol fuel blends. Pre-filtering keeps your fuel cleaner and helps your engines operate more efficiently.