Each one of these PUR water filters for faucets filters up to 100 gallons or 378 liters of water before it needs replacing. Step 1 of this three-step system traps sediment, step 2 uses carbon filter to remove contaminants and step 3 filters water through natural minerals for a crisp, refreshing taste. PUR 3-Stage Horizontal Faucet Mount Filter: * 3-stage filtration system: * Step 1 traps sediment * Step 2 uses carbon filter to remove contaminants * Step 3 filters over natural minerals for a crisp, refreshing taste * Filter Life indicator announces when filter should be changed * Easy on/off switch with bypass feature * Easy installation on all standard faucets * Includes 1 filtration system and 1 filter * Filters up to 100 gallons (378 liters)