Clear, clean, great-tasting water for drinking and cooking is easier to achieve than ever before with the Culligan US-2-R two-stage under-sink Premium Filtration replacement cartridge set for Culligan US-2. The Culligan US-2-R Under-sink Premium Drinking Water cartridge set features a twist-on, twist-off cartridge design for easy cartridge change. The filter reduces lead, microbial cysts such as crytosporidum and giardia, lindance, atrazine, bad taste & odor, aesthetic chlorine taste & odor. The US-2R cartridge set has a life of 6 months or 500 gallons. The US-2-R is certified in the US-2 by IAPMO R & T