Many cats and dogs are poor drinkers, leading to unnecessary kidney problems, urinary stones and urinary tract diseases. Drinkwell® Original has a free-falling jet of water which encourages pets to drink more so they stay healthy and get enough water.Holds 1.5 litres.Ramp on which water runs down prevents splashing and noise.Adjustable flow rate.Lowerable pump makes the fountain almost silent.Lid to prevent leakage.Replaceable charcoal filter removes bad taste and smell.Dishwasher safe (not the pump).We recommend changing the filter every two weeks.Extra filter available for purchase.