Great value and convenience: Easy-to-change replacement filter provides up to 100 gallons (2-3 months) of quality water, right from your tap. PUR water costs less than bottled water. Automatic Safety Monitor Gauge: This patented feature comes standard on every vertical PUR faucet mounted model. It takes all the guesswork out of knowing when your filter is ready to be replaced. Bypass feature: With a twist of the wrist, the faucet mount tilts back to allow easy access to the sink and unfiltered water for washing dishes.