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For owners of larger garden ponds or swimming pools, the use of an external pond pump, or dry pond pump, is an essential purchase. Generally used as part of a gravity fed filter system, external pond pumps are perfect for large pools and koi ponds as they process a greater volume of water, and their robust and durable design ensures longevity and efficiency year after year.
Getting the size right is the key to a healthy koi pond and a happy pump. Choose a model that's too small and your filter won't receive enough flow to keep the water clear; too large and you'll be paying for running costs you don't need. As a general rule, you want your entire pond volume to turn over through the filter every one to two hours, though this depends on stocking levels and any features like waterfalls or bottom drains adding extra head height to factor in. If you're unsure where to start, use our pond pump size calculator to work out what you need before you buy. Get the sizing right and you'll enjoy clean, well-oxygenated water and healthy koi with minimal ongoing running costs.
When selecting a pond pump for your garden, you have the choice of either an external pond pump or a submersible pump. Due to its size, an external koi pond pump is fitted into the ground next to the pond, below water level.
Not only are dry pond pumps more energy efficient, external pond pumps are nearly always a better choice when combined with a pressurised external filter, as submersible pumps are less efficient at managing the back pressure of water.
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