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they undergo a long contact time within the counter-current. Enriched with organic substances, they rise to the
top and form a firm foam that is dehydrated and pushed into the collection cup. This method removes organic
wastes from aquarium water before they become part of the biological waste treatment cycle.
The venturi pump draws water out of the aquarium or filter chamber, mixes it with air in the pump housing
which is then cut into small air bubbles by the Aqua Medic 3D needle wheel (Fig. 2, No. 5). This water/air
mixture is then pumped into the reaction pipe where organic substances are taken up by air bubbles. Foam is
formed and pushed into the foam cup. The purified water leaves the skimmer via outlet and is directed back to
the aquarium or filter sump by the discharge (Fig. 1, No. 7).
4. Set-up
The EVO 500 is a skimmer that can be set up in various ways:
1. As an internal skimmer, directly mounted on a glass bar or aquarium pane.
2. Hung on the overflow edge of a filter chamber.
Set-up as an internal skimmer in the aquarium:
First of all, the skimmer has to be put together according to Fig. 1. It can easily be mounted at the aquarium
pane or a glass support by using the holding unit. The best place for mounting is either at the side or back –
well accessible but protected. The pump is put into the connecting piece (6) of the skimmer, the cable points
downwards and the air hose upwards to connect to the silencer (14). The sound absorber can be attached to
the foam cup (2) or an aquarium pane by using the holding unit (15).
To do so, take off the protective plastic
film from the tape. The adhesive surface must be clean and free of grease.
Fig. 4: Holding unit EVO 500
By using the mounting profile (11), the retaining plate (7) can be fastened to a bar or vertical pane. Further
down, a second profile (12) can be mounted as a spacer. The distance can be adjusted by using the screws
(12a) so that the retaining plate hangs down vertically. On the opposite side of the mounting profile, the
connecting piece (9) for the adjustment screw and holding plate are mounted. To do so, the adjustment screw
(8) has to be put through the hole (9a) of the screw holder, then it has to be screwed in the thread (10) of the
holding unit. This can be moved up and down by turning the screw (8). The skimmer is hung up by putting the
laterally mounted holding bracket into the slot (10b) of the holding unit. In order that the skimmer hangs
straight, a second holding unit with rubber feet (no picture) will be fixed as a spacer at the bottom of the
retaining plate. The skimmer is adjusted in such a way that the discharge is above water level.
Set-up in a filter chamber:
The EVO 500 can also be mounted at a glass pane of a filter chamber. The skimmer’s discharge (Fig. 1, No. 7)
is extended downwards to give a safe support. The skimmer needs at least 23 - 24 cm immersion depth (to the
bottom of the discharge (Fig. 1, No. 7).
