Hello

[ajstoneservices]

Wouldn't the paddle be best sited in a separate dip tube (into the effluent) where the gas is unlikely to escape from a wearing paddle bearing seal.

[Bill2]

I like the idea of stiration with the gas.
I was also wondering if this is an opaque tank? If you can't see the liquid level, you could run a site gage from the drain to the proposed effluent outlet. Different from the floating bucket effluent outlet, it probably has to be below the true liquid level, otherwise gas would escape and/or air would enter. It's a puzzle how to accomplish things with the minimum amount of holes. Or you could put an airlock on the effluent outlet, like they have on wine casks, but on a larger scale, or maybe pressure would be a better term.

B