Assuming an average hot tub of 400gal, which is used for 1 hour three times a week and covered the remainder of the time, what is the importance of the cyanuric acid in the water chemistry? The tub is only exposed to UV rays for 3 hours a week, which is 1/56th of a week which is 1.7% of a week. With such a small exposure to UV, why is it important to have any stabilizer in a hot tub at all? Does cyanuric acid prevent the general degradation of chlorine as well?
And a follow up question, does cyanuric acid interfere with the efficiency of bromine the same way it does chlorine? In other words, if a spa operator were using bromine tabs/sodium bromide and oxidizing with dichlor, would the cyanuric acid buildup from the dichlor eventually lead to problems with the resulting hypobromous acid?