Welcome to our forum.
$270 will buy a lot of dichlor.
Quick clearification. There is scientific proof that ozone oxidizes contaminates it comes in contact with. There is not however scientific proof that it makes an actual difference in how much chlorine you have to use or that it effectively sanitizes the spa water.
Think of ozone as this ... a red car is traveling east on I-80 in the Midwest and blue car is traveling west on I-80 in the Northeast....
As you know from the the thread last week, "in contact with" is the issue. It does not appear that it is possible to get enough ozone in solution in a hot-tub environment to accomplish much of anything (other than oxidizing the air in the injector tube! 8-)).
I must have missed that one. Do you have a link or pointer?
It was the one that Vermonter chimed in on. You were in it at one point. I know, because I disagreed with you, in my usual delicate way. If you missed it, I'll just apologize in advance.