Hi from Texas

[PoolStored]

It’s 40 then.

 

[HermanTX]

I edited my post - I meant to say 30 not 40. So it is somewhere between 30 and 60.

If you could not see the dot at 30 but can see at 40 then it is 40

 

[PoolStored]

Reread this:

CYA - Cyanuric Acid Test

Cyanuric acid (CYA) is the chemical name for the product commonly called “pool water stabilizer” … Read more…

www.troublefreepool.com

 

[Maldravus]

If you could not see the dot at 30 but can see at 40 then it is 40

I could see it at 40, but it was not a quick glance, it took me a couple seconds of looking. Not sure if that counts.

 

[PoolStored]

If you could not see the dot at 30 but can see at 40 then it is 40

Other way around…

 

[HermanTX]

Other way around…

Repeat filling to each next line and glancing until the dot is completely obscured and the tube looks like the “End Test” picture below. When the dot is completely obscured, note the number next to the fill line on your CYA view tube, then add 10 to that number. This is your CYA level in parts per million (ppm). CYA should be recorded as a multiple of 10 (i.e. 30, 40, 50, etc.) in PoolMath, to the forum, and with our FC/CYA tool.
For example, if your dot is not obscured at 60, but when you fill to the next line (50) it is obscured, then the transition from not obscured to obscured happened between 60 and 50. Because the scale is not linear between the lines, you cannot determine CYA between the lines, so we round up to the next higher 10. In this example, your CYA is 60.