Pond Information...

How do I work out what size of Pump or Filter I need?

Pumps:

Two simple calculations will enable you to work out the Flow Rate needed for your pond:

Firstly work out how much water is in your pond - the Total Pond Capacity - using the following calculation -

Max width x Max length x Max depth (in metres) x 1000 = number of litres
i.e. (2 x 2 x 2 metres) x 1000 = 8000 - therefore there are 8000 litres of water in that pond

You should now have the Total Pond Capacity from the above calculation.

Then just one further calculation is needed depending on what your pond contains other than the water -

small fish	koi / large fish	lots of plants	flow rate calculation	example (using 8000 litre pond)
-	-	YES	50% of Total Pond Capacity = Total Pond Capacity / 2	i.e. 8000 / 2 = 4000 litres per hour flow rate
YES	-	YES	66.66% of Total Pond Capacity = Total Pond Capacity x 66.66 then / 100	i.e. 8000 x 66.66 = 533280 / 100 = 5333 litres per hour flow rate
YES	YES	-	100% of Total Pond Capacity	i.e. 8000 litres per hour flow rate

Filters:

Bio-Filters should be matched to next largest capacity - i.e. if the total pond capacity is 8000 litres then a 10000 litre filter will be suitable

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NOTE: the above is a general guide but it is always better to have more flow rate and filtration than not enough.

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