Quote Originally Posted by rdefino View Post
My Ph is at 7.6, Fc at 7, TA I just bumped up from 50 a bit. Waiting to test again.

Now I have these HTH 3in tablets that I;m not sure if I should use, or just stay with the bleach and a powdered stabilizer, but the tablets contain:

trichloro-s-triazinetrione 93.6%
zinc sulfate 3.5%
other ingredient 2.9%

available chlorine 84%

as for this statement "As far as the CYA level goes, as long as you follow the Best Guess table to match chlorine levels to CYA levels, you'll be fine."

What is the Best guess table?


thanks
Best Guess Chart is --> here

You definitely do not want to use those tablets. First off, they are not even 99% trichlor but contain zinc sulfate and probably other trace chemicals to make the tablet dissolve slowly and/or resist absorbing water. "Good" trichlor tablets (if there is a such a thing ) are 99% trichloro-s-triazinetrione (trichlor).

Your FC, pH and TA look good. You can fine tune those parameters now as you see fit. So now just ditch the tablets and use only bleach to chlorinate your water. Anything else is going to add stuff you do not want in your water. Use the Best Guess chart to set your CYA/FC levels.

Also, keep an eye on the CC's. Combined chloramines are a good way to check pool water health. Clean pool water should have CC's less than 0.5ppm. It's ok for the CC's to spike up a bit every once in a while (in my pool, the CC's go up after rain) but they should come back down to normal levels within 24 hours. If you're seeing CC's above 0.5ppm sustaining for a while, it's a good bet you have some algae looking for a foothold.