High CYA levels disrupt chlorine’s ability to sanitize water.
According to J.R. Anderson in his article “A Study of the Influence of Cyanuric Acid on the Bactericidal Effectiveness of Chlorine” it takes 4 times as long to kill common hot tub bacteria when CYA is at 50 ppm and 6 times longer when CYA is 100 ppm.
The biggest issue, however, is the very short time it takes for CYA to reach those levels in a hot tub.
For example: a 300 gallon spa adding 1 ½ teaspoons of dichlor 4 times a week can build up a CYA level of 50 ppm in as few as 4 weeks and reach 100 ppm CYA in only 7 weeks.
Not only does this quick build-up of CYA cause problems with killing microorganisms which could potentially produce unsafe water, high levels of CYA can cause corrosion because it is part of the measured total alkalinity of the water.
The only remedy is to drain and refill the hot tub. At only 7 weeks of use, this becomes a huge hassle for hot tub owners and potentially why many hot tub owners feel spas are too much work.
That’s where the CYA free FROG @ease product comes in.