14
GB
In garden ponds the density of fish stock per cubic metre is usually
higher than in natural ponds. As the fish usually also receive more
food than in their natural environment, the amount of pollution due
to excrement is very high.
Excess growth of algae, as well as the high level of pollution
due to fish excrement causes a lack of oxygen in your pond; its
biological balance has been disturbed.
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Problem : the level of nutrients in your pond is too high.
The most effective solution to this problem is to decrease the
level of nutrients available by means of a biological process and
to remove excess nutrients while at the same time increasing the
oxygen supply.
The growth of algae can be restricted by installing a filter. Floating
substances (e.g. floating algae), which cause the water to be
murky, are filtered out and the water is purified. This helps the
pond to regain its biological balance. However, existing algae
(e.g. thread algae) visible at the time of installation must be
skimmed off (e.g. with the GARDENA combisystem Pond Net,
Art. No. 7933).
Where possible, the filter should be kept in permanent operation
and not be allowed to dry out.
When newly installed, the UVC-Pressure Filter Set only reaches its
full biological cleaning effect after a few weeks. Extensive bacteria
activity only takes place from a temperature of + 10 °C or above.
High density of fish stock :
Level of nutrients :
Installing a filter :
Note :
2. Safety Instructions
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The safety instructions on the GARDENA UVC Pressure Filter Set must be followed !
WARNING !
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Read the operating
instructions before
using the equipment
for the first time !
DANGER !
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Ultraviolet radiation.
Protect eyes from flash.
This radiation is harmful to eyes and skin.
➔
Never operate the UV unit when the
housing has been removed.
Electrical safety :
DANGER ! Electric shock !
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Disconnect the pump and the
UVC device from the power
supply before carrying out work.
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Inspect the equipment before use to
ensure that the pump and the UVC unit,
especially the power cable and plug, are
undamaged.
Do not use a damaged UVC unit or pump.
Do not use the light if the connection lead,
glass tube or the housing of the UVC unit
appear to be defective.
If the pump or UVC unit is damaged, please
have them checked by our GARDENA Service
Centre or an authorised electrician.
The UVC-unit and the pump must be operated
via a residual-current device (FI-switch) with a
nominal fault current
≤
30 mA (DIN VDE 0100-
702 and 0100-738).
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Please ask your electrician for his advice.
