I opened my pool today and added some stabilizer that i picked up from Walmart last year. I added 56 ounces as i could still see the black dot on the bottom of the tube when testing my CYA. The water was cloudy so i figured i had about 20 for CYA. I put the stabilizer in a nylon stocking and hung it in front of the jet. I had to leave for a few hours and my husband said there was white powder all over the bottom of the pool floor and vacuumed it up. He said he heard the stabilizer could damage the pool liner if left sitting there. Is this ok? Did i do something wrong or is this normal?