Sounds like you have enough oxidation going on without it.
I want to steer clear of any system that requires an oxidizer chemical be added periodically for the reason you mentioned. PP is even more expensive.
Some media such as manganese dioxide doesn't require that, and doesn't need to be replaced for a long long time.
I notice some media also looses it's coating, such as greensand, and needs to be replaced. Steering clear of that too!
Last edited by Cecil Baird1; 02/15/16 10:32 AM.
