Thank you for indulging in what is probably a very basic question for you all, but will help me understand how I am doing with my pool maintenance.
I know that you need alot of background info to help answer questions, so here are the basics.
I have an ~20,000 gallon inground pool and a ~600 gallon in ground hot tub. They are separate such that each is treated independently. Both are concrete and have a quartz type surface. I cant remember the brand name of the surface but its one of the newer types that is slightly rough (not the marcite type, but not the pebbletec type either)
For treatment over the past 14 months, I have been using an Eclipse 4 ozone generator on the pool and an Eclipse 1 ozone generator on the spa, along with supplemental chlorine and acid. The ozone is injected into the inlet of the pump.
The pool and spa are heated via solar panels (10 panels for the pool and 2 for the spa, each panel is ~50 sq ft). The pool has a 2hp pump which runs 9 hours a day with a DE filter and the spa also has a 2 hp pump which runs, on average, 6-7 hours a day and uses a 150 sq ft cartridge type filter. (The spa pump is controlled by the solar system such that if heat is available, the pump runs.) There is also a 3/4" booster pump for the pool cleaner which runs ~3 hours a day as the cleaner is the type driven by pressure not suction. The pool temperature runs ~95-97F in summer and ~72-74F in winter.
The pool has looked fantastic during these 14 months and Ive had no issues at all. I try and keep the chlorine levels as low as possible (as in ~1 ppm or so). This seems to be working with the ozone, but I am not sure if the chlorine is actually doing all the work and the ozone is just "fluff".
So, to help answer that question-----
For a pool and spa of this size, in a 12 month swimming season environment, about how much chlorine should I expect to be using?
Ive kept track of my usage, and in ~14 months Ive used ~38 lb of 3" chlorine tablets and ~6 jugs of liquid chlorine. The tablets are added via a floating dispenser, and I just dump some liquid in periodically if the level drops too low (to give the pool a quick boost).
Is that about what one should expect to use in a pool like this regardless of whether or not ozone is on the pool? In short, is the ozone cutting chlorine usage down, or is it just another (expensive) box hanging on the the wall? I have no complaints on the water quality with the regimen I have been using, I am just curious as to how much of the water quality is due to chlorine and how much is due to the ozone.
Thanks for the guidance.