Reverse Osmosis to Lower CYA

In the swimming pool industry, Cyanuric Acid (CYA) is discussed a lot. Typically it is discussed the most when the levels get too high and you need to do something about it. First and foremost, CYA is known as a stabilizer and if used appropriately it can be extremely effective in preventing chlorine loss. In the swimming pool industry, the standard levels are 30 – 50 ppm but sometimes higher if you have a salt chlorinator. But, what happens when the levels get high? What happens when someone tells you that you need to drain your pool to remove it? At Pure Water Industries, we first want to say don’t drain your swimming pool but the best way to lower CYA in your swimming pool is by using RO filtration. To learn more about CYA and how it is used in the swimming pool we have written several articles about it which you can find in the following links:

• Does Reverse Osmosis Lower Cyanuric Acid?
• 5 Things You Need To Know About CYA

Just this past week we had a pool professional visiting us from Oregon who is looking into our mobile filtration systems to help with their CYA problems in their swimming pools. One of the best things about RO filtration is depending on where you live they can help with a lot of water chemistry challenges. Whether it is high levels of Calcium Hardness, TDS, or CYA it can lower them all and so much more. During the visit, we were able to showcase three different swimming pools. Two of them had high levels of CYA and the other was dealing with higher levels of Calcium Hardness and TDS. The pool that we will showcase in this blog was the first one we processed with our mobile filtration trailer and the following were the before and after water chemistry values:

Initial Chemistry:

Calcium Hardness – 400 ppm

Total Dissolved Solids – 1402 ppm

CYA = 100+ ppm

After filtering this residential swimming pool with RO filtration in San Diego we were able to lower their values to the following without draining the swimming pool.

Ending Chemistry:

Calcium Hardness – 110 ppm

Total Dissolved Solids – 323 ppm

CYA – 30 ppm

As you can tell the CYA was very high but after filtering with Reverse Osmosis the CYA levels are on the lower end of what is recommended and their hardness levels are low too. This leaves the customer with excellent water chemistry, an opportunity to conserve up to 85% of the existing water, and with a great pool to swim in next season. If you should have any questions, please contact us today!