Originally Posted by pickles
What caustic are you using? I've seen a commercial setup and you've pretty much nailed it's operation. They have the benefit of purging with CO2 and the end of the cycle.
Assuming this is directed @me: None currently. But I have a newly acquired 1/6th barrel sanke that has some oxidation spots inside which might require it before going into service (and I figured I'd start flushing all the kegs with caustic at least periodically at some point.)
Right now I just handle/rinse/wash them all by hand, but this setup with the sump is quite clever, especially if it will accommodate caustic. But that portion could always be a hand-operation and poured from keg to keg if needs be.