Thanks, great reply. You're right he did mention he shocked it that day. Chlorine seems the best option to start. Have you heard of a cup of Hydrogen Peroxide per day, nothing else? We know two people doing this and they love it. P.S. I always thought I was a pretty good speller..ha ha...
Thanks, I think we'll go with chlorine. We do have an ozonator, is that OK? Th spa will be really sheltered, under a roof, surrounded by deck, but outside. Thanks!