A Beginner's Guide to Cyanuric Acid in Your Pool

Cyanuric acid plays a vital role in most residential pools, especially pools that get plenty of sun exposure throughout the day. In this video, we take you through everything a pool owner should know when it comes to using cyanuric acid in a pool.
Companion article: poolonomics.com/cyanuric-acid/
Video Chapters:
0:00 Video Introduction
0:20 What is Cyanuric Acid?
0:50 Why is Cyanuric Acid Important?
1:24 How Does Cyanuric Acid Work?
2:12 What is the Ideal Cyanuric Acid Level?
3:10 Can You Use Too Much Stabilizer?
3:54 Does CYA Influence Other Levels?
4:25 What Causes CYA to Change?
5:31 How Do You Test Cyanuric Acid?
6:17 How Do You Adjust Cyanuric Acid?
7:48 How Do You Maintain Cyanuric Acid?
8:37 Video Conclusion

[@Peter-Alexander]

Excellent advice! I have a swg but until now I have been able to use 25 to 30 ppm CYA and maintaining 7.5% of free chlorine. So since 30ppm already gives a 98% protection per hour I am ok. I think using 60 to 80ppm would only increase kill times of bacteria etc. Some say however the swg has to work less so you would increase the life expectancy. On the other hand high levels of chlorine are not advisable for the pool (esp vinyl) and are not good for bather comfort. So my ideal CYA values is 25 to 30ppm. Thanks for this video!

[@jimknecht6285]

If CYA does not evaporate with water, then why does topping up the pool to replace the water that evaporates raise the CYA level? Example. In a 25000 gallon pool the water weight is 195000 lbs (25000 gallons times 7.8 lbs / gallon). For CYA concentration of 30ppm, then there is 195000 times 30/1000000 = 5.85 lbs of CYA. If 1000 gallons of water evaporated & was replaced with 1000 gallons of fresh water, then the amount of CYA in the pool is the same (CYA does not evaporate) and the evaporated water has been replaced with fresh water, then the ratio of CYA to water is the same. However, the video at 5:25 states topping up the pool with fresh water will dilute & lower your CYA.