Product Description The S1A Basic Whole House filter from Culligan helps reduce sediment, rust, scale, dirt, coarse sand, and sand from your water supply. This leaves your water visibly cleaner and tasting better. The Culligan S1A sediment water filter replacement cartridge lasts up to 4 months or 16,000 gallons, providing your home with higher quality water that will not only be better for drinking, but will also help protect appliances and plumbing from sediment and scale. With a 20-micron rating and pleated paper, this filter is NOT recommended for use with untreated well water. The filter is NSF certified and includes a 2-year warranty and change reminder sticker. 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.