Pond pumps are used alongside water features such as fountains and waterfalls as well as filters in order to recirculate the water. This helps to keep the water well oxygenated and when used with a filter, can help to keep it clear and healthy. There are two types of pond pump; surface and submersible . Surface pumps run above ground and are usually housed whereas submersible pumps run under the water. There is a large selection of pumps available but they mainly fall into two main categories; pumps to run water features such as fountains or waterfalls and pump to shift solid waste material into a filtration system. Of course, the outlet from a filter can be returned to the pond via a waterfall.
One thing to bear in mind though. It takes a considerable amount of pressure to pump water uphill. If you intend to run a waterfall, then think carefully about the height to which you want to pump water before choosing a pump. The more water you want to pass through the waterfall, and the higher you want to make the feature, the bigger the pump you will need.
For waterfalls, you will need to know the width of the lip feeding back into the pond. A waterfall will need at least 250 litres per hour for every inch of waterfall lip width and so if you are considering a 6″ waterfall lip, you would need to pump 6 x 250 = 1500 litres per hour.
Most pumps today state in their specifications the amount of water they can pump at a certain head height or head rate. This is the height above water to which they can pass water at the given flow rate. So if you know that you want to pass 1500 litres an hour through a waterfall which is situated at 2 feet above the level of your pond, then you need to look for a pump which states that it can pump at least 1500 litres an hour at 2 feet head height.
For a fountain you will need to choose a pump with a fountain head long enough to reach above the surface of the water. These pumps usually have an integral “filter” which stops any debris being drawn up into the fountain head and blocking the spray nozzles. Don’t be fooled into thinking that these sponge filters will clear your water. They are there only to stop blockages and will need clearing out often.
For a filtration system, then you need a large pump capable of handling solids. These pumps usually state that they can pass through solids of up to a certain size such as 5 mm and this debris gets passed right through to your filter system.
For a more detailed discussion on pond pumps and advice on choosing the best pump for your pond, see our web site page on choosing a pond pump.
To see some of the pond pumps available now, see our pond pump shop page.