The Oase Pondovac Classic Pond Vacuum is a purpose designed pond sludge vacuum cleaner, which can remove loose particles of dirt up to 10mm in size, algae, string algae, sludge, dead vegetation and bits of leaves from the pond by way of suction. The Oase Pondovac Classic Pond Vacuum has a 27 litre tank is made of impact resistant plastic and features a unique sludge draining system. The sludge is drawn through an adjustable suction nozzle (2-10mm) into the container via a 4m connecting hose. Once the container is full of sludge, the motor switches off automatically (Reed Switch). As soon as this happens a special valve at the end of the 2m long discharge hose opens automatically allowing the sludge to drain out of the tank. This takes approximately 25 seconds. The Oase Pondovac Classic Pond Vacuum then starts up again. Included are 3 extra vacuum style nozzles and a net for the discharge hose to catch large particles, such as leaves and blanket weed.