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Calculating Pond Capacity
It is important to calculate the correct pond capacity to enable the right level of filtration to be chosen for your pond and a to give a guide on a minimum flow rate to work in conjunction with any filter.
The easiest way to do this is to measure the length, the width and the depth of your pond in feet. If your pond is not a regular shape you will need to work out the average of all sizes and use this to calculate the capacity.
Once you have all three dimensions you need to multiply these all together, and then multiply this calculation by 6.25.
e.g. a pond that is 10feet long and 10feet wide and 2feet deep would use the calculation:
10 x 10 x 2 = 200
200 x 6.25 = 1250 gallons
Remember this is a guide…
If you require this capacity in litres which most companies now work with you will need to multiply the number of gallons by 4.5
e.g. calculate the number of litres by knowing the pond is 1250 gallons:
1250 x 4.5 = 5,625 litres
Again this will give you a guide…
This calculation also works the opposite way to find the number of gallons from know the number of litres in your pond by dividing instead of multiplying.
e.g. calculate the number of gallons by knowing the pond is 1250 litres:
1250 / 4.5 = 1250 gallons.
Simple….
Moving on to a choosing the correct filter for your pond…
All filters have a guide to the maximum pond size they will cope with usually they will also specify this for different levels of fish stock and sunlight.
If not, and If you intend to have a highly stocked fish pond then we recommend you should aim to have a filter to cope with one and a half times the capacity of the water in your pond, And if the pond is also in direct sunlight we recommend a filter to cope with twice the capacity of water.