Thank you for viewing. ☆Instant purchase OK☆No price reduction☆No splitting up the set. TOTO water purifier cartridge TH637RR with triple filter, a great deal with a set of 3! - Model name: TH637RR - Brand: TOTO - Quantity: Set of 3 - Features: Equipped with a triple filter Removes 2+1 substances Quantity: 1 cartridge per box Applicable faucets: TK306ARSX, TKG39UPRX, TKG37URX Usage guideline: Replacement目安: Approximately 6 months (when using 10L/day) PFOA/PFOS removal Standard type The lifespan of the water purification capacity may be significantly shortened depending on usage, water pressure, water quality (turbidity, red rust, etc.), the condition of the water supply equipment, the aging of the pipes, and plumbing work. Successor to the old model numbers TH637 and TH637N