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What Size Pump Do I Need?

The pump is a vital part of your pond’s filtration system. Without a pump, your pond’s water would not move around and would instead become a stagnant, unhealthy environment for your fish and plants to live. The more populated a pond is, the more crucial it is for your pump to be able to push the correct capacity of water round the system per hour, as more fish stock means more excretion which can lead to detrimental effects to the water’s health.

Before you buy your pond pump, however, it’s essential to calculate what size pump you need for it to do its job correctly and effectively. Pond pumps are sized by the amount of water they can circulate per hour.

First things first, you need to calculate the capacity of your pond to know what you’re working with.

Pond Capacity 

Firstly, work out your pond’s water volume.

Pond Volume (m³) = the surface area of your pond (sqm) x the average depth of your pond (m).

Then simply multiply your pond volume by 1000 to find out how many litres of water your pond’s capacity is.

The two most important factors to consider when deciding on your pond pump size is the flow rate and head height.

Flow Rate

The purpose of your pond pump is to move the pond’s water around and supply it to the filter system for it to be cleaned. A healthy pond needs its entire water content circulated at least twice an hour to stay in the best condition and for the best quality water.

The amount of water a pond pump can circulate in an hour is called the flow rate, and you need to ensure that the pump you choose for your pond can withstand the capacity of your pond size.

For example:

If your pond has a volume of 5000 litres, then you need a pond pump that has a flow rate of at least 5000 litres per hour at the given head height.

Thankfully, there’s a great range of pond pump sizes available that factor in a wide range of flow rate capacities, which means that it’s as easy as it’s ever been to pick the correct sized pond pump for your pond.

Head Height

The higher water is pumped vertically the lower the flow rate, so it is important to factor head height into your calculations when choosing a suitable pump. The head height for a pump is the measurement of vertical lift to the highest point, or in other words, how high above the surface of the pond your pump needs to push the water. Head height is especially crucial if you’re planning on having a waterfall or water feature to ensure that the pump size counters the height the water needs pushing to.

You need to make sure that you choose a pond pump that can still push the capacity of the pond at the head height you require.

Pond Pump Tubing

It’s also important to factor in the size of your pond pump’s pipework. Smaller pond pump tubing can restrict the amount of water the pump can circulate; this can have detrimental effects on your pond water’s health. In an ideal world always choose the largest pipe diameter your pump can accept for an optimum flow rate.

What Size Pond Pump Do I Need If I Have Koi Fish?

A Koi pond works differently to other stocked ponds when you consider a pond pump because koi fish make approximately four times more waste than typical fish. This means that the water in a koi pond needs circulating at least once an hour to avoid stagnant waste in the pond water.

How Important Is It To Choose The Correct Pond Pump Size?

The pond pump keeps your pond water moving and in turn healthy and clean – making it a vital part of your pond’s filtration system. Calculating the correct size necessary for your pond is essential, and hopefully, we’ve given you some tips to think about before you purchase.

Our range of pond pumps at Pond Planet includes a wide range of sizes that can handle a variety of capacities. Take a look today and pick the best pump to play the heart of your pond.

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