1st Im a new spa owner, After about the 3rd time using the hot tub with the wife no clothing temp about 95-98 I like it cooler. The water was cloudy I have the Nature 2 spa purifier it the tub. when I went to my local spa dealer he gave me some shock he told me I don’t need any thing ells with the Nature 2 in the tub just add shock 1 time a week. I added 3.5oz of the shock like the directions say but the water didn’t clear up waited 2 days with pump running 6hrs a day. Today I started new drained it cleaned filters put fresh water in why didn’t the shock work?

I think you need to have Chlorine or Bromine in there to help kill bacteria or you're going to end up with a bad situation (see threads on rashes et al.)

As a new spa owner who's been thru the rash thing, trust me, you don't want to go there.

My preference is on Chlorine (Di-Chlor) granules.
Add about a 1 tbsp after every use. Shock with a non-chlorine oxydizer 1 or 2 a week - depending on use.

Good luck

thanks for the info