AquaOxy 2500 by Oase (UK) LtdAquaOxy 2500 Pond Aerator Pump The OASE AquaOxy 2500 is a robust, ultra quiet and reliable air pump for garden ponds up to 25,000 litre Oase AquaOxy is representative of a pond aeration concept that ensures the perfect climate in the garden pond. With up to 5000 litres per hour air displacement, and infinite adjustment, all pond types and sizes can be perfectly supplied with oxygen. The unique part is that it is the only fully outdoor weatherproof air