And you're measuring how?

Residential pools don't need ozone unless the bather load is really high. It doesn't lower your pool's chlorine demand unless you fall into that category. That is a very rare need.

Scott

I use Tropix pools and have never had a complaint about their service of my pool. I pay a flat fee that includes all chemicals and treatments, seems like an incentive for them to put in less chemicals. If you are paying for the chemicals it might be the way to go. Also, like Scott says, how do you know they are applying too much?

Here is a link that might be useful: http://www.tropixpools.com/