Ouch! IMHO, find another installer, fast!

Ozone systems have a bad rep in the USA, and chlorinators (other than SWCGs--salt systems) ultimately cause problems. Do yourself a favor and learn about the B-B-B (Bleach--Borax-Baking Soda) method of maintenance we advocate here. There is no such thing as a "maintenance-free" system but you CAN reduce it to a simple, easy system with some knowledge, some planning, and a good test kit--the Taylor K-2006 and K-2006C are what we recommend.

You'll do far better with a properly planned and implemented salt-water chlorine generation (SWCG) system than an ozone and inline chlorinator.

Ultimately, the CHEAPEST effective system is the manual B-B-B system. You only need to test and adjust consistently and will spend less than 5 minutes a day + 15-30 min once a week. When comparing costs of automatic systems, even SWCG, to adding bleach, the bleach comes out FAR cheaper. I put in an SWCG this year because I'm away a lot, but up till now could not justify the cost.