CYA testing

[whataboy]

Pool sparkles like diamonds, numbers are spot on, but when I test CYA (Taylor K-2006 kit) several times with same sample I get a 30 then a 40 then a 35. Pool store tells me its 60 haha. This is one of the hardest test to determine where you really are with CYA. I run test just like Taylor video instructions.
Added bleach last night and checked an hour later and FC was at 5 @ 9:00pm
This morning 6:00am before daylight had a FC reading of 4.5 (only 0.5 loss)
4:30PM today FC at 3.5 (1.5 loss in almost 24 hour period)
Thinking my CYA is about 40. I'm using the TFPC CHLORINE / CYA Chart
If someone could come up with a better way of testing CYA with accuracy, he or she would become a $MILLIONAIRE$ several times over.
Any input would be appreciated, Thx.

 

[Azgirl71]

The CYA test can be very hard to determine. If you tested as the video shows then that is all you can do. I would say it is likely close to 40 based off of your testing. If I recall correctly there can be a little variance in the test maybe 10-15ppm but call it 49 for now.

 

[BoDarville]

Here's another resource with more details on the testing process: Extended Test Kit Directions. CYA is covered in Post #8.