Welcome to our forum.
Did you ever figure out what was causing your reaction to ozone in your hot tub? I have the same reaction and it seems to only affect me. The rash started after we added the Ozone.
Ozone in hot tubs shuts off when any of the buttons are touched. It will not come back on for at least 40 minutes after the last button was touched. It is a safty feature because ozone is a poisonous gas, and it can burn your skin if you hold your body next to the jet it is coming out of. Ozone also should not be run in indoor tubs unless you have proper ventilation. After it shuts off, it dissipates very quickly, no risdual is left in the water.
Someone has grossly misinformed you about ozone.
Sorry guys. Different strokes for different folks. Some spas have the ozone turn off, others do not.