CYA: A quick explanation to this controversial topic in pool care

CYA (Cyanuric Acid)

    • If you’ve owned a pool for more than a day, you’ve probably realized that your pool water is a bit fickle. It can go from clear and clean to cloudy and green in what seems like seconds!

Today, we’ll cover one of our least favorite reasons for this: Cyanuric Acid (CYA) levels. Cyanuric Acid can be defined as a chlorine stabilizer or conditioner for swimming pools. It acts like a sunscreen for the chlorine in your pool. Chlorine typically burns off by ultraviolet rays from the sun, CYA prevents that and allows chlorine to remain in the pool while keep your water clear. You want your CYA levels to be between 30-50 ppm for a salt water generated pool, you will be looking at 70-80 ppm. Anything above 50 ppm or 80 ppm for salt water pools, will take longer to kill the bacteria in the water.

The unfortunate side of CYA is when the levels become too high, it will work in reverse and mask the chlorine. Thus limiting its effect and causing your pool to turn green. Your CYA levels can increase when you add a stabilizer product, use tri-chlor tablets, or use certain types of shocks that are paired with a stabilizer.

While there is Bio-Active CYA reducers that will lower your CYA levels. You can get the number down by also draining a portion of your pool water, and refilling your pool with fresh water. Do not drain the entire pool as that will cause issues with the stability of your pool’s walls. You can either do multiple partial drains or simply go for it and drain around half the pool. Once the pool has been refilled, test the water and treat it to get the chemical composition within normal range again.

There you have it! Defeating one pool chemistry problem at a time! We know that pool’s can be a complicated mess and we are always willing to help. Let us know if you run into any obstacles or have any concerns about your pool.

Common items that have CYA in them:
-Trichlor Tabs
-Di-Chlor Shock
CYA Reducer:

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When Kevin’s not enjoying the water himself he’s engaging himself in the wide world of pool and spa knowledge which he passes on to our customers through producing content for our blogs and website. Outside of the pool world you can find him enjoying life with friends, family and his off the wall dog Brixton.