[mark]

I've got the G3, did the recir and gate valve mods but don't think they're really that necessary, as had good performance prior.

Main thing is you want the water level constant so place in the sump section where water level doesn't vary (not pump side).

For the G3 seen something like the water level be about 10-12" up the body of the skimmer, imagine similiar for G2.

For adjustment you raise or lower the pipe so the bubbles are midway up the cup. As the unit starts to pull stuff out of the water the bubbles will start to rise higher up the cup. If skimmate too light, lower the pipe a slight bit (1/4"). Not getting skimmate raise it, again found sensitive so small adjustments.

Don't be surprised if the unit takes a day of two to start producing.