The Catit Stainless Steel Drinking Fountain features a high-quality stainless steel top. This source of fresh, circulating water encourages cats to drink more, which helps ensure proper kidney function. The hygienic stainless steel top is dishwasher safe and helps inhibit bacterial growth. The large water-to-air drinking surface maximizes oxygenation. The Catit Stainless Steel Drinking Fountain has a compact 2 L reservoir (64 fl oz). The product is easy to disassemble and clean. This fountain includes one replaceable Catit Dual Action Fountain Filter (50029). Replacement filters sold separately.