Why lower levels of Cyanuric Acid are better for your pool

Why lower levels of Cyanuric Acid are better for your pool

Cyanuricacid

Cyanuric acid (CYA), also known as stabilizer or conditioner, is a chemical that serves as a protection shield for chlorine against sunlight. The sun’s UV rays degrade chlorine rapidly,which can create problems for outdoor pools. Studies show that sunlight can wipeout chlorine by 75-90% in a matter of two hours. Though, with the use of CYA, the life of chlorine can be significantly extended. Like many chemicals, CYA has extraordinary benefits along with consequences.

Just like any other chemicals, CYA must be kept within a certain range. APSP states that the ideal range for CYA should be 30 to 50 ppm and that no increase in stabilization was seen above 100 ppm. The CDC, WHO and the Ten State Standard also agree with this statement. The state of Florida recommends no more than 40 ppm. Wisconsin recommends no more than 30ppm. Many other states are beginning to enforce lower ranges as well, including New York, as their health code requires 0 ppm CYA in public pools. Some studies show that even 2-3 ppm of CYA can prolong the longevity of chlorine allowing for consistent pool sanitation.

There are definitely benefits of keeping CYA on the lower end of the range. When CYA levels get too high, it holds  onto chlorine so well it diminishes its effectiveness. With a reduction in the chlorine’s potential to oxidize, there is an increased risk of algae growth and high levels of harmful bacteria circulating in the water. High levels of CYA can also negatively impact proper protection for plaster surfaces. It produces a false reading of alkalinity, so while the test may read 80 ppm, it is actually much lower than that causing the water to be acidic and resulting in plaster degradation.

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