Gardena Art. 7910 - Manual (Page 3)

Cleaning the Pond Filter :
15
G
14
G
3. What You Should Know About Ponds and Filters
Garden ponds are not as deep as natural water features. The lack
of depth means that a garden pond heats up and cools down
much more quickly. These changes in temperature and environ-
mental factors such as fertilisers, plant residues etc., are among
the main causes of excess levels of nutrients and hence of growth
of algae.
In garden ponds the density of fish stock per cubic meter 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 bio-
logical balance has been disturbed.
➔ 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).
4. How the Pond Filter Works
! Water inlet
Connection for connecting the hose to the pump in the pond.
" Mechanical coarse filtering
Large particles of dirt are filtered out of the water by the
foam filtering elements.
§ Mechanical fine filtering with Zeolith
GARDENA Zeolith increases the surface area for more
efficient cleaning.
$ Second connection
For connecting two Pond Filters in parallel (the second
connection is sealed with a plug at the factory).
Excess growth of algae –
murky pond
High density of fish stock
Decrease the level of
nutrients and increase
the oxygen supply
Installing a filter
5. Using the Pond Filter for the First Time
1. Screw the hose clockwise onto the thread G 3/4 (26,5 mm)
of the pump.
2. Screw the hose clockwise onto the thread G 3/4 (26,5 mm)
of the Pond Filter.
3. Position the Pond Filter and Pump in the garden pond so that
the Pond Filter and basket of the pump are completely covered
by water.
You can fill the pump basket with stones to make the pump
more stable.
You can achieve the best cleaning results by using your Pond
Filter in the dirtiest area of the pond.
We recommend using two filters for ponds larger than 16 m 3
with slightly dirty water or for ponds larger than 8 m 3 with very
dirty water (ponds containing fish).
Operating two filters in parallel :
1. Screw another hose clockwise onto the second connection
of the first Pond Filter.
2. Screw the other end of the hose onto the connection of the
second Pond Filter.
Operating two filters in series:
1. Press out the cap a of the lower Pond Filter from the inside.
2. Remove the lowest part of the filter b from the top Pond Filter.
3. Position the second Pond Filter on top of the first Pond Filter.
6. Pond Filter Maintenance
The GARDENA Pond Filter is largely maintenance-free.
However, it may require cleaning from time to time.
1. Unplug the pump from the mains.
2. Remove the Pond Filter from the pond.
3. Unscrew the hose clockwise.
4. Empty the Pond Filter completely.
5. Press in both clips
1 at the same time and remove the top
part of the filter.
6. Remove all other parts of the filter in the same way.
7. Remove the foam filter elements
2 from the filter and rinse
under running water.
8. Also clean the round foam filter element 3 under running water.
9. Remove the Zeolith 4 from the bottom part of the filter and
clean (using saltwater, for example).
10. Reassemble the Pond Filter in the opposite order.
11. Screw the hoses back onto the Pond Filter and position in
the pond (see “Using the Pond Filter for the First Time –
Initial Operation ”).
To ensure the zeolith functions correctly, we recommend you
replace or clean it every 6 months (e.g. in salt water).
GARDENA Zeolith, 1 l Art. No. 7914
GARDENA Zeolith, 5 l Art. No. 7915
$
!
"
§
a
b
Initial operation :
Second filter :
2
3
4
1