how does one tell if an ozone generator is working.. I know the flow is working, just wondering if there is really ozone.. spa is d-one with ultra pure..

The nose knows...
There isn't really a ppm test- generally, you can smell it.

I contacted D1 and they said even if it was working, it was too old be be effective. Now for the $64,000 question.. Can the ultra pure ozone generator be replaced with the delzone ultimate platimum unit ?? seems like it is cheaper to replace cd chips every few years rather the the entire unit.. apparently D1 thinks so also as newer units have a cd style ozone gen..

Pretty sure the ultra-pure is mounted inside the control box- you could make something else work, but it would be alot easier to just replace with the D-1 replacement Ozone

It is inside the control box and the del unit will not fit.. However Balboa makes a uv light unit that will fit and costs about half what the d1 replacement costs.. do you think there would be any problem using it..

Can you smell it when you open your cover??

you should. I describe it as a "sweet" smell.

Good morning I think it could be what i call-- hot tub smell -- i'm not shure if its sweet