Our CYA readings have always been normal at 30-50ppm. We use Trichlor tabs in chlorine feeder. Just 3 days ago we shocked with the Clorox 4 in 1 formula (sodium dichlor). Big mistake. Now my CYA readings are OFF THE CHARTS at 150. HOW?! Could my test strips be wrong? According to the calculator on this site CYA should have only gone up about 6ppm. What happened?! We used one pound of the shock treatment, and our pool is about 11,000 gallons.
I've since turned chlorine feeder off completely to stop addition of even more CYA. FC and TC are staying high around 8-10ppm thanks to all this CYA and no sunlight at all the last two days.
I do only use the Aquachek pool testing strips. Getting a decent FAS-DPD testing kit via amazon on Wednesday.
I guess my question is: is it possible to raise CYA from 40 to over 150 in just one shock treatment? How does this happen?
Before shock: CYA = 30-50ppm
After shock: CYA is off the charts. test strip looks like 150 but i know anything over 100 can't be measured accurately
I've since turned chlorine feeder off completely to stop addition of even more CYA. FC and TC are staying high around 8-10ppm thanks to all this CYA and no sunlight at all the last two days.
I do only use the Aquachek pool testing strips. Getting a decent FAS-DPD testing kit via amazon on Wednesday.
I guess my question is: is it possible to raise CYA from 40 to over 150 in just one shock treatment? How does this happen?
Before shock: CYA = 30-50ppm
After shock: CYA is off the charts. test strip looks like 150 but i know anything over 100 can't be measured accurately