I don't mean this to be ...

Published February 13, 2021 17:30 by Terry Scheurman, President at Applied Specialties, Inc.

I don't mean this to be insulting to any of the other responses. You need stop and look at what you wrote COD 800ppm. What is COD? Chemical Oxygen Demand. This is going to be created by some form of reducing agent or an organic than can be oxidized by an oxidizing agent under the COD digestion conditions The easy way to identify which it is will be to use a milder oxidant to see if you can reduce the COD. Try using hydrogen peroxide or even bleach at room temperature and pH 7. If that works, you have your easy fix. Also remember that the COD will do very little to feed your bugs. Hope this helps.