Reduces fine dirt, sand, silt, rust, and scale to provide visibly clearer water that helps protect your appliances and keeps your faucets flowing freely. 10 micron filtration. Durable polypropylene fiber cord wound construction. Filter life up to 3 months or 12,000 gallon. Use with filter model No. HF-150, HF-160, or HF-360. 2 per pack.