cyanuric acid

[idiotowner]

I pput a new vinyl pool in this spring. Shocked weekly, used 3intabs about 3per week (30000gal. pool). and everything looks great. suddenly got a bit of algae, that would keep coming back. Had water tested and they say I have 112ppm of cyanuric acid and pool is in chlorine lock. I never checked this level. My stupid test strip doesnt have it. What the heck went wrong, what are my options now. Help

[idiotOwner]

Me again. My cyanuric acid is 95ppm and I was told to close for winter after I balance everything else-then use non stable clhlorine tabs. Anyone hate this idea?

[Guest]

Makes logical sense to use unstabilized chlorine as your pool water has reached the upper limit for stabilizer.