CYA level for AZ pool

Queequeg

Well-known member
May 6, 2008
48
Arizona
A question for the AZ TFPers.

I live in a hotter part of Arizona (Marana), and my new pool gets full sun. What level should my CYA be? The temperature is regularly well over 100F for 3-4 months in the summer (Sunday is predicted to be 101), and my CYA is currently 65.

I use bleach, and have no SWG.
 

JasonLion

TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
37,879
Silver Spring, MD
If your pool gets direct sunlight all day, ie no trees/house/hill shading the pool at all, in a sunny area like Arizona, I would run with CYA between 60 and 80.
 

JasonLion

TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
37,879
Silver Spring, MD
At higher CYA levels you need more and more FC to keep the pool sanitized. At some point the FC gets high enough that it becomes difficult to measure the PH, since high FC level can interfere with the PH test. It also becomes difficult to measure your CYA level because the standard test only measures to 100. And it takes truly amazing amounts of chlorine to shock the pool.
 

Queequeg

Well-known member
May 6, 2008
48
Arizona
Noted. According to the awesome power of the pool calculator, I need to keep a minimum FC of 5.0 with my CYA at 65, which doesn't sound too extreme.

Thanks again for your help.