And maybe I described it not correctly. So I have 4 chamber sump. In chamber 3 I have a separate pump which connected to the reactor. And outlet from the reactor goes to chamber 4 where is return pump, the hose from reactor stay right next to the inlet of return pump. If you could suggest any idea for improvement, I'll be much appreciated.I dont think I have ever come across anyone using your method, it does not sound like the best way.
Why cant you use a by pass and valve and flow the reactor straight back into the main tank?