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Failure
(1) After about three days of
operation, the foaming effect
of the skimmer is insufficient.
(2) The skimmed liquid is very
„clear".
(3) The foam formation
decreases or is too low.
(4) Small bubbles are still
released from the openings of
the skimmer housing after
three days of operation.
(5) The drive of the pump section
fails.
36
Cause
(a) The water has an excessively high surface tension,
caused by fat (sebaceous matter) or high-fat food. The
sebaceous matter is introduced when working in the tank
or handling the devices.
(b) The nozzle is soiled.
(c) Small stones or other rough matter are located in the high-
pressure impeller housing.
(d) The high-pressure impeller does not run freely and is stiff.
(e) The aquarium has too few skimmable substances, such
as proteins, cellulose, algae, excretory matter of animals,
and food remainders.
(f) The water level is too low, and the skimmer runs „dry".
(g) The pump stops, and starts operating again after a short
time. Before shut-down, the motor turns hot due to a
damage in the motor block.
(a) The unit has been operating for one to two weeks only (=
running-in period); the skimmer has been fitted recently
or has been cleaned.
(b) The skimmable matter in the aquarium water does not
permit a different skimmer water, because invertebrates
or large numbers of algae are present predominantly, but
no or little excretory matter of fish, which would permit a
darker skimmer water (depending on the fish food).
(c) After extensive care activities in the aquarium, more
skimmable substances are released (such as removal of
algae, cleaning of the bottom).
(a) The pump / nozzle system is soiled.
(b) The air inlet or the area around the air regulating screw is
clogged.
(c) The air hose has yielded to buckling.
(d) The air inlet is disturbed at other parts.
(e) The skimmer has not been operated long enough.
(f) The skimming process is impaired by fat or nicotine.
(a) Due to the oxygen saturation (surplus) caused by the
activities of the algae, the skimmer appears to be a bubble
producer. The real sources are of biological origin - please
refer to „Aquarium Ecology" published by TUNZE
Aquarientechnik GmbH or to our Internet forum
(www.tunze.com).
(a) The motor block is defective.
(b) Foreign matter is blocking the impeller.
For other failures please refer to the instructions for use
of the pump.
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