Deltec TC 2561 Instructions D'emploi page 13

Feed line
In order to achieve best results it is important to fit a shut off cock into the water feed line.
This allows exact regulation of the water flow to compensate variations of existing salinity
and water pollution. The diameter of the feed line should not be smaller than the skimmer
inlet. When choosing a pump to supply the skimmer, the capacity should be somewhat
higher than the recommended maximum flow through the skimmer (see technical data).
The optimum flow through the skimmer can than be adjusted with the shut-off valve in the
feed line (Diagram d).
Outlet
The skimmer must be installed in such a way, that the cleaned water can flow unrestricted
back into the sump (or aquarium). Never fit an outlet pipe higher or smaller in diameter
than existing on the skimmer. When installing the skimmer directly to the aquarium, the
skimmer outlet must be positioned higher than the top rim of the aquarium (Diagram e). A
degassing set can be supplied to reduce air bubbles entering the aquarium from the outlet
pipe.
d) Shut off valve inlet e) Skimmer directly to the aquarium
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