I built a kalk reactor (leaky PoS) and had to keep my outlet higher than the reactor or else it would drain a little when it stopped pumping to stir. The issue became that the reactor was taller than my stand, so I couldn't add it to the sump. I finally just gave up on the reactor and am much happier mixing it manually in my top off water. I have a used electromagnetic dosing pump (over $1000 brand new) that I set to match my evaporation rate. It makes a click, click, click, click every time it pumps, but it's in the basement so I don't care

I stopped using my ATO float a while back, and I really can't use it now with the surge device, even though the frag tank absorbs ~90% of the fluctuation.

This is just one of those questions that has been floating around in my head for a while.