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You have probably turned to these pages because your pond has become murky or you are experiencing health problems with your fish. The typical pond easily becomes polluted for four main reasons:
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It is relatively shallow and warms quickly to encourage algae growth.
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Little water movement and no fresh water running into it.
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Stocking levels are higher than you would find in nature.
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The breakdown of fish waste and dead vegetation pollutes the water.
In lakes a natural balance between pollutants and cleansers keeps the water clean. A filtration system will help create and maintain this balance in a pond and reduce the risk of oxygen depletion.
. How to measure your pond correctly

Follow these steps to ensure you choose the right size of pump, filter and ultra violet for the amount of water your pond holds.

Calculate the volume of your pond using the following formula:

Calculate the size of your pond

Litres

Average Length (m)

x

Average Width (m)

X

Average Depth (m) = m³

m³ x 1000 = Litres

Gallons

Average Length (ft)

x

Average Width (ft)

x

Average Depth (ft) = ft³

ft³ x 6.23 = Gallons

Litres example

Average Length = 3m

x

Average Width = 1m

x

Average Depth = 2m

3m x 2m x 1m = 6m³

6m³ x 1000 =6000 Litres

For specific pond shapes follow the instructions below:

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Calculate how much water a Rectangular Shaped Pond will hold

A length metres x B width metres x C depth metres

= Volume m³

Volume m³ x 1000 = Litres Capacity

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Calculate how much water a Triangular Shaped Pond will hold

(A length metres x B width metres x C depth metres) ÷ 2

= Volume m³

Volume m³ x 1000 = Litres Capacity

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Calculate how much water a Circular Shaped Pond will hold

A radius metres x A radius metres x 3.14

= Surface Area m²

Surface Area m² x B depth metres = Volume m³

Volume m³ x 1000 = Litres Capacity

Additional factors to consider

If the average depth of your pond is less than 0.7m and/or in full sunlight,you may need a bigger system.

Depth less than 0.7m

OR in full sunlight

Add 25% to pond

Capacity example:

Pond Capacity

1000 litres x 1.25 = 1250

Effective Pond

Capacity = 1250 litres

Depth less than 0.7m

AND in full sunlight

Add 50% to pond

Capacity example:

Pond Capacity

1000 litres x 1.50 = 1500

Effective Pond

Capacity = 1500 litres

 
Water Gardening Direct Ltd
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