Product Description The S1A Basic Whole House filter helps reduce sediment, rust, scale, dirt course sand and sand from your water supply. This leaves your water visibly cleaner and tasing better. From the Manufacturer The Culligan S1A 2 pack whole house sediment water filter replacement cartridge filters scale, rust particles, sand, dirt, & silt for basic filtration. The filter life is 4 months or 16,000 gallons. The filter has a 20 micron rating, pleated paper, For use with model #HF-150, HF-160, HF-360 and most standard size sediment filters. The filter is NSF Certified and a 2 year warranty. It also includes a change reminder sticker.