Using the tank droping is fine just ph it first the hard water is the stuff you need to worry about to much HW will add extra minerals and that not good for you plants........goog luck on the grow
sound ok to me just make sure that it go's up and not into the bathroom And I don't think it will go in the the upstair apt if that was the case you be smell somebody else shit all day.....good luck hope it helps
I had that same problem I don't now what it is but I konw it will kill your roots so I flush with a good PH water and cleaned the system real good with bleach and water if you don't clean the system it will come back good luck I hope this helps.