I've been using ozone in the treatment of my well water for years, however I don't use it in my pool treatment. My well water is extremely bad, and prior to using ozone my testing revealed that one gallon of 12% Cl would treat 83 gallons of water. Since ozone is 100's of times more effective than Cl, it made sense to move in that direction. However since the life of ozone is so brief, I inject Cl at the pressure pump in order to maintain a disinfectant in the water system.

Why not in the pool? In my instance, the pool is covered at all times, and hence the pump run time is 4-6 hrs a day thus limiting the amount of sanitizing time. Moreover, ozone is expensive to purchase and maintain - Cl is much easier to measure and provide continuous disinfectant.

I assume that your ozone generator is a UV type that generates .5 gr/hr. My initial generator was like that but it didn't last too long, and I've since gone to corona discharge generators. I've purchased the generators from Del Ozone and the injector from Mazzei, both websites provide info on sizing, engineering and installation.

Injecting ozone in the pot drain maybe be feasible yet the air will collect in the filter. Del Ozone has the philosophy that the lesser the air flow thru the generator the better. Since ozone is an oxidizer as the air flow increases the amount of dirt particles also increases, and the ozone is oxidizing the air and not the water.

Over the years I researched water tx, in all of its forms, and alot of it is trial and error. Cl makes treating the pool very simple.