The additional reservoirs are ideal for use in multiple cat or small dog households. Quick and easy to attach to the Drinkwell Pet Fountain! Two sizes available: 1.5 litre Additional Capacity Reservoir Doubles the capacity of your Drinkwell Pet Fountain! Cuts down on refilling! Add over 2.5 pints (1.5 litres) of storage for a total of over 5 pints! 2 litre Additional Capacity Reservoir PlusSuitable for medium sized dog up to 50 lbs. Cuts down on refilling! Add over 4 pints (2 litres) of storage for a total of over 6 pints! Keeps your pets supplied with twice as much thirst-quenching fresh water! Q How much water does the Drinkwell for Cats and Small Dogs hold? A The basic unit (original) holds 50 fluid ounces (American), which is about 1.5 litres or 2.25 pints. An Additional Capacity Reservoir adds a further 1.5 litres and the Additional Capacity Reservoir Plus adds about another 2 litres. Q When should you use an Additional Capacity Reservoir? A The basic unit should be fine for up to 2/3 cats or a small dog. If you have more than 2/3 cats or a cat and a small dog using the fountain you should use the Additional Capacity Reservoir to avoid the water being used up and damaging the motor. Quick and easy to attach to the Drinkwell Pet Fountain! Only for use with the Drinkwell for Cats and Small Dog. Not suitable for the Drinkwell Big Dog as it comes supplied with its own reservoir. Capacity sizes are approx. References to 'gallons' are US standard not Imperial.
