Pumps:

Notes on pump selection:
There are many factors which dictate the output of a pump. To keep things simple we will consider just the height you are pumping ("head") and the pipe size. Head is the distance the pump has to lift the water above the pond's surface; therefore it is the vertical height from water level in the pond to the top of your waterfall (for example). The depth the pump is in the water is irrelevant. The higher the pump has to lift the water; the lower the output.

The pump hose slows the water down by virtue of friction against the hose wall. Therefore the further you pump, the less water you will get at the other end. Try to keep the diameter (bore) of the pipe as large as possible, since this will reduce friction loss and give you more water.

E-mail us with a question if you would like help with choosing your correct pump size.

Pond Filtration:

The choice of filter will depend on the size of your pond and the number of fish. To calculate the size of your pond, use the following formulae:

Round pond:
1) Measure the diameter (in metres) and divide by 2 to find the radius.
2) Calculate: Radius x Radius x 3.142 = the area of your pond in square metres.
3) Area x depth (in metres) = the volume of your pond in cubic metres.
4) Volume x 1000 = the volume of your pond in Litres.

Square or rectangular pond:
1) Length x width x depth (in metres) = the volume of your pond in cubic metres.
2) Volume x 1000 = the volume of your pond in Litres.

 Gravity Filters: (e.g. Oase Biosmart, Screenmatic)

• Installed above ground; water is pumped out of the pond and returns by gravity

 Pressure Filters: (e.g. Filtoclear)

• These can be set below water level since they are fully sealed. Many people bury them in the ground with only the top accessible for maintenance

Ultra-violet clarifiers:
Bombard floating algae with Ultraviolet (UV) light as it passed through the UVC sterilizer unit, killing it. The dead algae clumps together (flocculates) and is then easily removed by your filter.

• Bitron clarifiers fix directly to the side of Oase Biotec and Proficlear filters to form an integral unit.

Pond Construction:

Liners:

Butyl
Our preferred liner for all applications. Butyl is thin and flexible, making it ideal for folding or smoothing out on gentle curves. Very easy to work with and simple to repair if damaged.

EPDM
A thicker material suitable for more regular shaped ponds since it is less easy to fold. Flexibility is similar to butyl.

Geotextile
Sometimes called fleece, this is used to protect the liner from damage. We recommend a complete layer beneath the liner and a layer on top where soil, concrete or brickwork is installed. Our geotextile is non-woven, with a weight of 250 grammes per square metre.

When calculating the size of liner required remember to allow for the depth of the pond and any planting shelves. 

Pond Volume Calculator

Calculate the volume of your pond (in litres) by entering the average length, width and depth (in metres), then press the Calculate button.

Balancing Tanks

This allows the pond to be kept clear of pumps, valves and other equipment while providing easy access for maintenance. The balancing tank is connected to the pond by an underground pipe which means that they both have the same water level. A mains water top-up valve and an overflow pipe are fitted to maintain a constant level in the pond.