The function of pond pumps are to move and circulate the water in the pond. This movement agitates the pond to avoid it becoming settled and stagnant – it also helps to introduce additional oxygen into the water. Oxygen in the water is vital to sustain life such as plants or fish.
If you are looking to add a fountain or waterfall pump it is important to know the size of the pond and how high you would like to lift the water in the fountain.