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Wet foam: With freshly prepared sea water, after using water conditioners or at extremely high
loading, excessive wet foam may be produced. This wet foam is forced into the cup, requiring more
frequent emptying than normal. After approx. one day, the aquarium load will be normal and the
skimmer will produce correct foam.
Dry foam: Not enough foam or if the foam is too dry, this could be an indication that the needle
wheel is dirty or the venturi is contaminated. A thorough cleaning is recommended.
4.6. Parts of the venturi pump
Fig. 4: Venturi Pump
1. Lid of pump housing
2. Pressure connection fitting
3. O-Ring
4. Rubber bearing, 2 pcs.
5. Ceramic shaft
6. Washers
7. Rotor (magnet and impeller)
8. O-Ring
9. Engine block
10. Intake socket
11. Bayonet lock
12. Mounting plate
13. Rubber sucker, 4 pcs.
4.7. Maintenance
The collection cup should be cleaned regularly (daily or weekly, depending on the organic load).
The reaction pipe of the skimmer needs to be cleaned only once or twice a year. The venturi pump
should be cleaned at the same time. The pump has to be removed and the complete pump housing
and the needle wheel flushed with clean water. The same procedure should be done with the air
injection nozzle.
4.8. Problems
Problems may arise if the ration of drawn air and water is not correct.
The reasons could be:
-
The air injection nozzle is clogged or the pump housing with needle wheel is dirty (remove and
clean).
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In calcareous aquarium water, the nozzles often can get clogged.
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If the nozzle cannot be removed mechanically, the whole nozzle should be put into vinegar or
citrus acid over night.
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