of vinegar. The effective lifetime of the PL UV-C lamp is about 7,500 burning hours.
If used continuously, the UV-C lamp will consequently last for one pond season. It
is recommendable to install a new UV-C lamp in March. Place the spacer round
the lamp for more stability (18, 36 and 55 Watt). Only after a week or two, the output
of the PL UV-C lamp will be optimum. This is a normal process for this type of lamp.
DIRT INDICATOR
The dirt indicator (6) on top of the cover indicates the extent of contamination in
the filter materials and thus the flow rate of the filter. By increasing pollution in the
filter the indicator will move from green through orange to red.
l Green: no pollution, optimum flow rate
l Orange: increasing pollution, limited flow rate
l Red: heavy pollution, impeded flow rate
OPTION: UV-C UNIT
UV-C light destroys many harmful organisms, like algae. The water is sterilised and
floating algae, germs and moulds are killed. A special feature of this filter is the option
to install 1 or 2 UV-C Units. Velda supplies suitable UV-C Units of 9 Watt for the Clear
Control 25, 18 Watt for the Clear Control 50, 36 Watt for the Clear Control 75 and 55
Watt for the Clear Control 100. These units can be easily mounted in place of the screw
caps (5). The advantages of UV-C are that it makes green water clear and it is an excel-
lent agent to fight bacterial infections. The Velda Clear Control pressure filters have a
separate compartment, preventing the UV-C radiation from touching any of the filter
materials. In this way the micro-organisms in the filter material will not get damaged.
We advise you to let the UV-C lamp burn continuously during the pond season.
OPTION: HEATING
Besides the UV-C Unit a heating element can be mounted in the Clear Control 50, 75
and 100. This option is unique. By removing the screw cap (5) the heating element can
be simply fitted into the filter. Application of a heating element has 3 advantages:
1. The warmer water will activate the development of micro-organisms in the filter
material and consequently the decomposition of organic components will increase.
2. The filter can also be used during the winter months (up to a temperature of -10°C ).
3. If the outflow hose of the filter will be placed near the surface of the pond water,
the pond water will not freeze (up to a temperature of -10°C).
GENERAL INFORMATION
Clear water is the basis for the biological equilibrium in a garden pond. The most
important factor for the pond environment is the water, the composition of which is
of direct influence on the growth of the water plants, the development of the micro-
organisms and the condition of the fish. The water therefore should contain all ele-
ments that are necessary for the biological and chemical processes in the pond envi-
ronment. If all values are correct and the micro-organisms function well, it can be said
that there is a biological equilibrium. For many ponds, filter equipment is an essential
tool, because often too many fish are kept in proportion to the quantity of pond
water. In a garden pond a fish has far less water at its disposal than in the wild and the
natural equilibrium will be attacked more quickly by the many excrements that are
produced by the fish. This is certainly the case with Koi. Filters serve two important
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