The Culligan® S1A 2-pack Level 2 Extra Filtration cartridge reduces sediment, rust, scale, dirt, coarse sand, sand and silt. The replacement cartridge fits the following models: HF-150A, HF-160, HF-360 and most standard size housings. The filter is not recommended for use with non-treated well water supplies. The cartridge life is up to 4 months or 16,000 gallons. Cartridge change reminder sticker included. For Use With TV#'s 216912, 529096 & 583328.