Cyanuric acid (CYA) helps stabilize chlorine in a pool. It shields chlorine from the sun’s rays and blocks its harshness in the water.

CYA levels that are too high or too low can minimize the effectiveness of chlorine. Knowing the right amount of CYA you need in the pool is important.

The CYA calculator can help take some of the guesswork out of the amount needed and give you better control of the CYA level in the pool.

Cyanuric Acid Calculator


How to Use The CYA Calculator

There are only a couple of items that you need to use the CYA calculator:

  • The pool’s volume in gallons. If you do not know it, use the pool volume calculator for a close estimate.
  • Your current CYA level
  • Your desired CYA level

The calculator will let you know how much CYA you need based on your pool’s size.

It’s important to note that CYA can only be decreased by partially draining and refilling water. With this in mind, add CYA in increments and test along the way.

To get a more general idea of CYA dosage, refer to the chart below:

chart showing how to increase CYA with cyanuric acid

Your Pool’s Volume is Important!

Knowing how much water your pool holds is an important aspect for pool chemistry. A 20,000-gallon pool will need significantly more CYA than a 5,000-gallon above-ground pool.

The most effective way to determine the pool’s volume is by looking at the build schematics or asking the builder for that information if they still have it.

Otherwise, the volume calculator above should give you a rough estimate.

Stay On Top of Testing

You are going to want a testing kit that is reliable and accurate when it comes to CYA readings. The Taylor K-2006 includes a fairly simple CYA test that you can rely upon.

Best Overall Kit
Taylor K-2006
$78.99

The most accurate and reliable pool testing kit.

Read our full Taylor K-2006 Review.

Type of Chlorine Test: FAS - DPD
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05/07/2024 06:03 pm GMT

Let CYA Be The Best Protector It Can Be!

The overall goal is for chlorine to be as effective as possible when it is in the water.

Cyanuric acid helps achieve that goal. Use the calculator to help you understand how much is needed, add in increments, and then enjoy the pool!