Culligan Basic Water Filter Cartridge 2-Pack an effective solution to maintain clean and clear water by removing dirt, sand, silt, rust, and scale particles. Featuring a 20-micron nominal filtration, these cartridges are made from resin-impregnated cellulose, which enhances their strength and durability. Designed to last up to 4 months or filter up to 16,000 gallons, these cartridges are compatible with Culligan models HF-150, HF-160, HF-360, and most standard size sediment filters. This pack ensures your water filtration system continues to perform efficiently, providing you with fresh, clean water for everyday use. Model Number: S-1A