Velda VEX-100 Mode D'emploi page 13

environment, and the natural equilibrium is also rapidly eroded by the many wastes
produced by the fish. This is certainly the case with larger fish like koi. Filtering keeps
the water clear and, by circulating the water, also ensures there is sufficient oxygen.
The VEX filters filter both mechanically and biologically. A brief description of these
two methods is given below.
Mechanical filtration
The mechanical filter operates by removing organic and inorganic particles of dirt.
To prevent the filter material clogging up, it should be regularly rinsed clean.
Biological filtration
A biological filter is based on the principle of a better and swifter degradation of
organic matter through the use of micro-organisms. A fully activated biological filter
encourages general micro-organism activity and so stimulates the growth of aquatic
plants. Biological filtration is recommended when plant growth is stagnating and
algae development excessive. Initially filtration will be mechanical only, but in time
the materials will become biologically active through the growth of micro-
organisms. You can kick-start this process by adding a dose of Bacterial or Biobac to
the filter materials.
THE VEX POND FILTERS
The VEX Pond Filter is an ideal filter system for your pond. It has several advantages
over other systems. The capacity of the "active components", and hence the filter's
purifying capability, is greater than in common filter types. Both the mechanical and
the biological functions are combined in this filter. The filter materials used render
both functions highly effective. The filter has a built-in UV-C Unit. The filter also
remains watertight under pressure and has no difficulty pumping up water to a
height of 3 metres (depending on the pump output). Connecting up the filter is very
easy. In short, with this purchase you will make your pond clearer and healthier.
The VEX Pond Filter cleans the water in the pond in three stages.
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The first stage is mechanical. The visible dirt particles are removed by filter foam.
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The second stage is biological. The growth of micro-organisms is encouraged
through the use of so-called bio-filter balls. These micro-organisms remove
organic components from the pond water.
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The third stage consists of UV-C treatment of the water. The UV-C light kills
germs and floating algae. The result is clear, healthy pond water.
There are three types of VEX Pond Filter:
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VEX-100 with a net filter volume of approx. 10 litres and suitable for ponds up to
6,000 litres, with a built-in 7 Watt UV-C Unit.
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VEX-200 with a net filter volume of approx. 20 litres and suitable for ponds up to
10,000 litres, with a built-in 9 Watt UV-C Unit.
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VEX-300 with a net filter volume of approx. 25 litres and suitable for ponds up to
15,000 litres, with a built-in 11 Watt UV-C Unit.