Quote Originally Posted by aylad View Post
You pobably have just used cal-hypo powder to shock the pool with, if you've been operating based on the pool store's recommendations. Don't use any more cal-hypo, and the levels should drift down as you lose/refill water. 300 is a little on the high side, but as long as you keep your pH and TA fairly low, and don't add any more calcium, it shouldn't create a problem for you.
Ugh, you're 100% correct. My powder of choice was the Powder Plus. I had a bag left over from last year sitting on my shelf. After reading the ingredients, it's 73% cal-hypo.

I'm using nothing but bleach now. Well, except for the tri-chlor tablet in the floater...which I only plan to use until my CYA reaches 50.