PUR Ultimate Faucet Mount However, with the Pur Ultimate Faucet Mount, you can have pure and fresh drinking water straight from the kitchen sink! Just attach the Ultimate water filter to the faucet, install the Pur water filter and you're all set! The Ultimate water filter removes microorganisms & reduces Trihalomethanes (TTHMs), chemical chlorine byproducts that increase risk of cancer Automatic Safety Monitor Gauge shuts off filtered water when filter needs replacement Each filter provides 100 gallons (2-3 months) of quality water