CYA added per 3" tablet of trichlor - the answer?

[bdavis]

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Darn! Good catch. You are correct.

Color me stupid, guess I was thinking something else.

Carry on!

Cheers

[Rangeball]

What is the % of available chlorine stated on the bucket of tabs you have? Does it correlate with the CYA % so that together they equal 100%?

Just curious, cause if it does it would seem you could subtract the chlorine % from 100 and get the CYA total for other manufacturers pucks and sticks. EDIT- nevermind, I just checked, was thinking something else when I posted this. The label on my sticks says "90% available chlorine" and 99% trichlor...

I used to use 8 oz trichlor sticks from Blue Wave. I have 12 left. I had been contemplating adding them to my pool to get the CYA up. If I use the % you listed above, each stick would have 4.32 oz of CYA. Using the bleach calc, to raise CYA in my pool by 10 ppm (21,200 gal) I would need 27 oz or 6.25 sticks. Not very many, and I can easily see why I had so many CYA problems in the past and didn't even know it.

I've decided against adding more CYA, as I have about 10-20 right now, and my FC is holding good and staying lower on CL keeps me in line with the capabilities of my OTO test kit

[aquarium]

Yep, I'm running 10-20ppm CYA as well, for the same reasons. But I like my auto-chlorinator and wanted to be able to calculate about when I needed to drain and dilute, rather than use the clunky turbidity test which doesn't go lower than 20ppm anyway. At this rate, it ain't long!