Installation
Lay the outlet pipe for the water outlet into the pond and the hose for the sludge drain into the sewage system or flower
bed (8) with a sufficient gravity (i.e. slightly downhill). Place the unit at a flood protected position at a distance from the
pond edge (7) of at least 2m on a firm and level ground. Ensure unrestricted access to the cover to be able to carry out
work on the unit. To avoid pressure loss, use hose connections which are as short as possible and have a maximum
internal diameter; avoid bends and lay well protected, saw off the open stepped hose nozzle (2) at the corresponding
mark. Push or turn the hose for the water inlet onto the open stepped hose nozzle and secure with a hose clip. Place a
flat sealing ring on the thread of the stepped hose nozzle, push the thread of the stepped hose nozzle through the water
inlet, insert an O ring on the thread from inside, screw the inlet nozzle on the stepped hose nozzle from inside ensuring
that the opening points downward. Close the second water inlet with the closed hose nozzle (except when fitting an OASE
UVC pre-clearing unit, e.g. Bitron). Lay the hose so that it cannot be stepped on, avoid kinks and connect it to the pump.
During normal filter operation, the sludge drain should be closed using the cover cap. To permanently fit a 2" hose to the
sludge drain, unscrew the cover cap from the dirt drain, push the union nut over the 2" hoze nozzle, push on the hose
and secure with the hose clip, insert the flat sealing ring in the union nut and firmly screw-tighten the 2" hose nozzle
including the union nut on the dirt drain. As an option, you can permanently fit a 1/2" connection for a garden hose to the
fresh water connection (1) and to connect the OASE pond aerator AQUA-OXY 400 to the air connection to ensure an
adequate oxygen supply to the pond.
Start-up
Prior to starting up the unit, check that all clamps on the internal cover are closed. The clamps for pond additives can be
used to supply additives such as filter starters to the filter and the pond (optional). Switch the pump on. Note: The Biotec
filter is a biological filter system and requires several weeks after its first installation to reach its full biological effect, and
must be run continuously to retain the biological efficiency.
Maintenance and cleaning
Adhere to the safety information given above! Only clean the unit when required, do not use chemical cleaning agents to
permit the filter biology to optimally develop, knowing that cleaning agents kill the bacteria in the foam filters. Clean the
filter system immediately when the float switch in the water level indicator becomes visible from outside. Switch off the
pump and open the unit cover.
Cleaning foam filters
To mechanically clean the foam filters, pull on the cleaning handles and "pump" (3) several times neither too strong nor
too fast. If necessary, unscrew the cover cap from the sludge drain, open the slide valve (4), allow the water to drain
completely, close the slide valve again; repeat the cleaning process 2 to 3 times, if necessary. If necessary, remove the
foam filters and clean more thoroughly in a bucket of pond water. To this effect, press the engagement of the cleaning
handles to the side until the connection to the inner cover disengages. Release the clamps at the inner cover and remove
cover. Pull the foam filters from the foam filter holder (6), spray clean the container, the inner cover, the cover and the
foam filters with clean water. Reinsert the cleaned foam filters in the foam filter holders (the green foam filter in the black
foam holder). Pull the handles of the foam filter holders through the slots in the inner cover from below until the foam filter
holders engage. Insert the inner cover into the filter container and fold over all clamps, fit filter cover and switch on the
pump. Replace the foam filters if the float switch of the water level indicator keeps showing a medium to heavy soiling
following the cleaning process.
Cleaning the water level indicator
Turn the water level indicator counter-clockwise (5) through approx. 30° and pull out of the inner cover. Remove the plug
and the float switch out of the housing of the water level indicator and clean using clear water. Reassemble in the reverse
order such that the float switch can move freely in the housing.
Storage/Over-wintering
Put the unit out of operation at water temperatures below 8 °C or, at the latest, when freezing temperatures are to be
expected. Drain and thoroughly clean the unit, check for damage. Remove, clean, dry and store all foam inserts in a frostfree
environment. Ensure that the storage place is inaccessible to children. Cover the filter container such that the ingress
of rain water is excluded. Drain all hoses, pipes and connections as far as possible.
Wearing parts
Foam filters are wear parts and are excluded from the warranty.
| Trouble Shooting | Cause | Remedy |
| Water stays cloudy |
Unit has been in operation only for a short time |
The complete biological cleaning effect is only achieved after several weeks |
| Inadequate pump capacity |
Readjust the pump capacity |
| Water extremely soiled |
Remove algae and leaves from the pond, perform a partial water change |
| Excessive fish and animial population |
Remove some of your fish |
| Foam filters soiled |
Clean foam filters |
