Wow TRe...where did you find a $30 overflow? I have never seen them under $100.
As far as the ball valve there is no problem with putting it on the return line...what you do not want to do is put it on the overflow or in front of the pump.
Dark will definitely help with algae, but I would consider getting a clear one as it will help you keep an eye out for potential problems/clogs in the system.
As far as the ball valve there is no problem with putting it on the return line...what you do not want to do is put it on the overflow or in front of the pump.
Dark will definitely help with algae, but I would consider getting a clear one as it will help you keep an eye out for potential problems/clogs in the system.