X-Pools Explains Cyanuric Acid’s (CYA) Role In Pool Care – And More!

 In Pool Care

Many of our Client’s on our X-Pools service routes are seeing increases in the cost of chemicals for their pools this year.  The cost increases are attributed to 2 factors, increased chlorine consumption and X-Pools shift to alternative sanitizers. [i]

Increases in chlorine consumption are a common problem for many pools in the Southwest & the Valley of the Sun. As our temperatures increase, so do our water temperatures, leading to increased sanitizer requirements, historically chlorine.

One problem is with our local industry’s standard of using tablet chlorine. Trichloroisocyanuric acid (tablet chlorine) is one of the least expensive forms of chlorine delivery for pools in Phoenix & the Southwest.  A by-product of tabs is Cyanuric Acid (CYA) also known as Stabilizer or Conditioner. CYA protects Chlorine compounds from being broken down by Ultraviolet rays, but too much CYA reduces the effectiveness of chlorine’s ability to kill germs, bacteria and algae.

According to the Association of Pool & Spa Professionals (APSP®) Service Tech Manual[ii] the recommended range for CYA is 30-50 part per million (ppm) with a maximum of 100 ppm. Many of our pool’s using tablet chlorine see CYA level increase to excess of 100 ppm in the first year after start up with new water.  See the attached graph[iii] for Free Chlorine (FC) residuals recommended at various CYA levels. The standard is FC at 7.5% of CYA, which means our tablet pools with 2-5 year old water require FC levels in excess of 15ppm or more.  The only way to reduce CYA in pools is to drain & refill with fresh water or treat via Reverse Osmosis (RO). RO costs more than draining but can save upwards of 50-75% of the water.

To improve this situation of killing our pool water with tablets, X-Pools has long been a proponent of the shift to non-chlorine based sanitization which includes Ozone for oxidation, minerals for algae control, Phosphate control and natural enzymes. We have not been successful in fully eliminating chlorine for our pools, but these methodologies help minimize CYA build up. We also utilize more expensive non-stabilized chlorine (liquid bleach) to help keep our FC levels in the healthful range.

Please contact us to learn more!

[i] www.x-pools.net

[ii] APSP Service Tech Manual, 4th Edition, copyright 2010

[iii] http://www.anotherperfectpoolnews.com/wp-content/CPODocs/CYA-Cl-Ratio.pdf


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