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I run a 6mm (1/4") JG tube into one of the air holes (has to drill it out slightly) and use a liter meter to pump 2L/day out and into a waste line.
Not the same as a drain line, but does the same thing. If the skimmer ever went nuts and produced more than 2L skimmate/day or the Liter meter failed then the cup could overflow. I could overcome this by adding a float switch into the lid to kill the skimmer should the cup fill I guess.
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