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You are right about the venturi valve. I see a large tube coming from a pump then going to a t-valve where the ozone tube come in. I’ll have to look at the showroom hot tub the next time I go in.

We’ve recently purchased a Bullfrog A7 hot tub, but I’m questioning whether or not the ozone generator is working right. Every time I go into the showroom, the ozone generator is running, but I have yet to actually see a stream of bubbles running from ours. Is there a mode to put the A7 into to...