Installing a filter, Cleaning the Pond Filter

3. What You Should Know About Ponds and Filters

5. Using the Pond Filter for the First Time

Excess growth of algae – murky pond

High density of fish stock

Decrease the level of nutrients and increase the oxygen supply

Installing a filter

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).

Initial operation:

Second filter:

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

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).
	∃
!
14

Cleaning the Pond Filter:

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 elements2 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