The PondoVac 4 is an excellent choice for contractors who need to clean ponds without any delays, even when the tank is emptying. It features an innovative two-chamber system that fills and empties in alternating cycles. When one chamber is full, a mechanical valve is triggered by a float, which then empties the first chamber and allows the second one to be filled. The product includes tube extensions that can help you reach difficult corners, and four suction nozzles, including a special one for sucking up string algae. It also has two wheels and a folding handle, making it easy to move around and use as a wet and dry vacuum cleaner around the house.