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THE CROSS-FLOW SWIRL
The Cross-Flow 'Swirl' with filter cassettes and 4 sophisticated filter materials, is based
on the flow principle. The water is passed along a standard UV-C Unit of 18 Watt,
through the various filter materials. The UV-C Unit ensures an effective treatment of
floating algae and any germs present. New and spectacular is the use of a nitrate
reducing filter medium. It is a glass-ceramic material with extremely fine pores,
which is capable of absorbing nitrates. This nitrate filter medium is placed in the
rotating holders (swirls), as a result of which the water treatment is optimum. The
filter also contains a cassette with highly activated filter carbon, a cassette with a
Japanese mat and a holder with fine filter foam. The cassettes with filter material can
be rinsed in a trice. All in all, the UV-C Unit and the sophisticated filter materials, this
Cross-Flow Swirl provides crystal clear and healthy pond water. Suitable for ponds
containing up to 10,000 litres of water.
INSTALLATION
The Cross-Flow Swirl contains 3 removable cassettes and a holder for filter foam.
The filter comes complete with all the necessary filter materials. Carefully rinse the
filter materials before use. Use the enclosed net for the filter carbon. Release the
swirls and fill them at the bottom side with the nitrate filter medium. Place the lid in
the correct position on the filter, ensuring that the connecting ring is placed in the
appropriate groove and close the filter with a fastening clamp. It is recommendable,
before closing the cover, to fill the filter with water.
Connecting the pump
The filter has a 32/40 mm hose connector for the intake opening. To prevent capa-
city loss, the hose connector must be sawed off to the diameter of the pump hose.
A flexible reinforced hose is recommended. Attach the hose with a fastening clamp.
Velda recommends using a minimal 2500 and maximal 5000 litres per hour pump.
The recommended pump is High-Stream 4500. These strong low-energy pond
pumps from Velda provide proper flow. They are maintenance friendly. The out-
flow swivel of the filter is 50 mm. Firmly tighten it with the jam nut in the outflow
opening of the filter. Use a suitable flexible hose here and secure this with a hose
clamp. To prevent leakage problems, the outflow opening should not be reduced.
MAINTENANCE
If the water output of the filter decreases considerably or if the lid is leaking, the
cassettes with filter material must be rinsed out. It is generally enough to rinse it
several times with tap water. The fastening clips have been constructed in such a
way that they will spring open when the pressure in the filter will become too high.
This will occur for example, if the filter material should contain too much dirt or if
any filter material would be used with a too small porosity for water. It is recom-
mended to replace the active carbon and nitrate absorbing filter medium once or
twice a year, or at least, at the start of the new pond season. If the water supply to the
filter is stopped for four or more hours, the filter material must first be rinsed before
filtration resumes. This prevents the micro-organisms which die from an oxygen
shortage from getting in the pond. It is recommended to use Bacterial Filterstart.
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