I have used ozone for the last 2 years. Water clarity is unmatched but I only run mine for less than an hour a day. I run a triton system so no water changes and a very large amount of chaeto. Within a month yellowing can be noticed if I don’t run ozone. Mine runs straight into the skimmer and my ORP rises to a max of 300. I am not chasing ORP figures. I wanted it to keep my water clean and it does exactly that.