Back on May 8th I tested my CYA level with both the Taylor K-2006 and the Blue Devil CYA test kit. They both read about 55-60 ppm. Using the Pool Calculator app on my iPod it recommended adding 2 lb. 3 oz. to my 26,200 gal. pool to raise CYA from 60 to 70 ppm. I put 2 lbs of Leslie's Conditioner (99% CYA) in a sock and suspended it from the skimmer cover. Today, 7 days later, all the CYA is dissolved from the sock so I rechecked the level, again with both kits, and it's reading right around 100 ppm. I even had my wife test it without telling her what my readings were and she came up with the same numbers.
Why would it rise so high? Is the Pool Calc app incorrect?
Btw, Pool Calc says I'd have to add 6 lb. 9 oz to go from 60 to 90.
Thanks for any help,