I have a 8x8 Calspa hot tub. I use Nature 2 and an ozonator. I shock it once a week with an over-sized 1/4 cup MPS and 2 teaspoons of dichlor. I use dichlor before and after each use. We use it in streaks sometimes going a 2+ weeks without use. I have done this for years and never had any water problems or health issues. The chlorine levels often go to zero, but I figured the Nature 2 and ozonator and weekly MPS/dichlor would keep it clean when not in use. It has been very low maintenance but is this risky? PS. Great board!
Am I taking a risk with my sanitation?
- Thread starter ScotR
- Start date
Welcome to TFP! 
Are you measuring the MPS as well not just the chlorine? If the FC goes to zero, that's OK so long as the MPS level is not zero since the silver ions in Nature2 plus the MPS are a disinfecting combination. In fact, many people use mostly Nature2 plus MPS and only use chlorine once a week or so. That's a low-chlorine recipe for those that want that and it's EPA approved.
Are you measuring the MPS as well not just the chlorine? If the FC goes to zero, that's OK so long as the MPS level is not zero since the silver ions in Nature2 plus the MPS are a disinfecting combination. In fact, many people use mostly Nature2 plus MPS and only use chlorine once a week or so. That's a low-chlorine recipe for those that want that and it's EPA approved.
Thanks for the info. Does the ozonatar provide any additional protection if the MPS goes to zero?
No, not usually, because 1) the ozonator is usually designed to not leave any substantial residual in the spa water because otherwise it would outgas and ozone is an EPA-regulated air pollutant and 2) the ozonator is not usually running 24/7 and is usually on only when the circulation pump is running. We have several reports of people who have ozonators and had spas that went south after not maintaining them, due to vacation or other reasons.
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