In the pool industry, Cyanuric Acid is known as chlorine stabilizer or pool conditioner. Cyanuric Acid (CYA) is a pool balancing product used to help chlorine last longer. Chlorine, in its natural form, is unstabilized—which means it degrades when exposed to sunlight.
Cyanuric acid is raised by adding chlorine stabilizer containing cyanuric acid. The only way to lower cyanuric acid is by replacing water.
But not every pool owner needs to worry about CYA levels. Because cyanuric acid protects chlorine from the sun, it's really only required for outdoor pools (or indoor pools with some ultraviolet light exposure). CYA stays in a swimming pool for a long time, even after the water evaporates.
Although there are no known adverse health effects associated with high CYA concentrations, most health officials usually limit CYA levels to 100 ppm. Some states recommend a lower level for spas, and some jurisdictions ban the use of CYA altogether.
The main reason for high CYA levels in your pool is from using too much stabilized chlorine. When the pool water evaporates, CYA remains in the water, much like other chemicals such as salt and calcium. As an example, 1 lb. of trichlor in a 10,000 gallon pool will raise the CYA level by 6 ppm.
Saltwater pool manufacturers recommend maintaining cyanuric acid levels around 60-80 ppm. This is a bit higher than the 30-50 ppm range recommended for non-saltwater pools. And if you live in an area where your pool gets a lot of direct sunlight, you may even consider bumping your cyanuric acid up to 80-100 ppm.
What happens when CYA in a pool is too high? – CYA Levels exceeding a threshold of 70 parts-per-million of cyanuric acid can reduce the effectiveness of the chlorine in a pool. The amount of time it takes to kill bacteria lengthens as the concentration of CYA increases. The ideal level for CYA is 30-50 ppm.
When cyanuric acid levels get too high, it can cause something referred to as chlorine lock, which basically means your chlorine has been rendered useless. You'll know it has happened when your chlorine test shows very or little chlorine even right after you've added it to the pool.
Cyanuric acid is present in drinking water when chemicals commonly referred to as dichlor (anhydrous sodium dichloroisocyanurate or sodium dichloroisocyanurate dihydrate) or trichlor (trichloroisocyanuric acid) are used as alternative free chlorine sources.
Summary. In summary, it's safe to swim in a pool with low cyanuric acid as long as you have the correct levels of free chlorine. To raise cyanuric acid in your pool, you'll want to test your water and determine how much you need to raise the stabilizer levels by.
Answer: Cyanuric acid shouldn't be at Zero for an outdoor swimming pool because chlorine will deplete faster in hot and humid weather, leading to cloudy water. If your FC is at normal level of 3ppm, raise Cyanuric acid level to 40 ppm and you will reduce chloramine levels that make your water appear cloudy.
Most often, the only time you'll need to add any significant amount of CYA is when you open your pool for the summer. After that, if you use stabilized chlorine each week, you're adding a little CYA every time.
As mentioned earlier, it will take at least 48 hours and up to a week to fully dissolve. Powdered cyanuric acid is not so common and it may not be available to buy in your area. It's reported to not dissolve any faster than granular stabilizer.
When Is It Safe To Swim After Adding Cyanuric Acid? As a general rule though, you can swim in your pool within 20 minutes of adding cyanuric acid. Make sure you have the pump on when you add it so that it mixes in the water. It's always best to check the manufacturer's instructions though.
You should keep your outdoor pool or spa's Cyanuric Acid level at 0-30 parts per million (PPM).
All alkaline materials are buffers. Cyanuric acid happens to be the most common buffer found in pool water. In effect, cyanuric acid helps stabilize both chlorine and pH. It binds with chlorine to prevent photolysis and it keeps pH elevated.
The half-life of chlorine—when exposed to direct sunlight—is about 45 minutes. That means half your chlorine is gone in 45 minutes. Another 45 minutes, another half of your chlorine is gone.
We also found that cyanuric acid is denser than water so it sinks to the bottom of a body of water.
Baking soda, also known as sodium bicarbonate is naturally alkaline, with a pH of 8. When you add baking soda to your pool water, you will raise both the pH and the alkalinity, improving stability and clarity. Many commercial pool products for raising alkalinity utilize baking soda as their main active ingredient.
Yes both cyanuric acid and muriatic acid are both acids but they serve different purposes for the pool owner. Cyanuric acid has the chemical formula CNOH, whereas muriatic acid is a diluted form of hydrochloric acid, HCI.
The CDC's Regulation on Cyanuric Acid: 15 ppm.
High doses of chlorine, like pool shock, can cause temporary cloudiness as it kills contaminants. High levels of pH, alkalinity, and calcium hardness are more likely to cause cloudy water.
But if the cloudy water persists long after you've shocked the pool, you're likely having an issue with water balance, circulation, or filtration. Heavy use of a calcium based pool shock (cal-hypo) may increase Calcium Hardness over a period of time, increasing your odds of cloudy water.