Best Way to Lower High CYA in a Swimming Pool

One of the most common water balancing issues is having high Cyanuric Acid (CYA) in your pool. Cyanuric Acid often referred to as Conditioner or Stabilizer is added to the pool in order to slow the chlorine burn-off caused by the Sun's UV rays. But if you use 3” Chlorine Tablets (Trichlor Tablets) you will be adding Cyanuric Acid to your pool on a constant basis.

Draining the pool completely or partially is the best way to reduce the cyanuric acid level in your swimming pool. There are of course other methods. One is to use a CYA reduction product like Bio-Active, but it is an expensive product and is also hit and miss. You may also want to try the Alum method developed by Rudy Stankowitz. You can read about that method here and the steps to take.

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If your CYA level is very low the Sun's UV rays will cause the chlorine to burn off quickly leaving your pool with no sanitizer or very low levels. The Conditioner in the pool helps to protect the chlorine from burning off too quickly. So a good effective level is somewhere between 50-80 ppm.
Very high CYA levels will make the chlorine in your pool less effective which means you will have to keep the levels very high in your pool to make it effective. Your pool may also develop algae blooms even with high chlorine levels present. These algae blooms are also hard to get rid of in a pool with very high CYA levels. High levels of CYA will also give you false ORP readings if your pool uses ORP to measure the safety and swimability of the water. High CYA also will give you a false Alkalinity reading. If you test the Alkalinity and it is at 100 it is more likely at only 70 if you use the Adjusted Alkalinity reading.

Bob Lowry suggest a free chlorine level of 7.5% of your pool’s CYA level. If the CYA is at 100 ppm your free chlorine needs to be at 7.5 ppm everyday to prevent algae and for it to be effective against viruses and bacteria.

Testing the Cyanuric Acid level in your pool at the beginning of the season is crucial. There are many ways to test the CYA level in your pool including the standard Turbidity test, digital testing, and test strips.

Testing the CYA level in your pool if you suspect very high levels can be challenging. The standard Turbidity Test Kits only work effectively to 100 ppm. If you get an initial reading over 100 ppm you will have to do a dilution test of 50% tap water and 50% pool water. If the reading is still high you will need to use 75% tab water and 25% pool water and so on. Each time you dilute the sample the reading becomes more difficult to nail down accurately. Test strips are a great alternative in pools that have high CYA levels. Most test strips will go as high as 250-300 ppm so this is a good way to check pools that have very high CYA levels.

LaMotte actually makes a test strip that will read CYA levels up to 500 ppm accurately. This is a very handy test strip to have if you service pools for a living. Just dip the test strip in and then match it up to the side of the tube where there is a color chart.

Since Cyanuric Acid does not naturally leave the pool water if you add it to your pool through the use of 3” Chlorinating Tablets the levels will constantly rise. These 3” Trichlor Tablets are over 50% Conditioner per tablet by weight, so as you use them in the Summer you are constantly adding Cyanuric Acid to your pool water. The only way Cyanuric Acid leaves the pool water is through backwashing and splash out. As the water evaporates the Cyanuric Acid will remain in the pool. To lower the CYA level in your pool you will have to do a partial or full drain of the pool water.

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