I opened my pool on Memorial day, on Tuesday 31st of May 2011. I found your forum to be an excellent source for pool information. I want to change over to the BBB, my pool is Kidney shape 16X32 15K gallons with a liner. After reading your information I found that the Chloro I purchase has copper (which I'm returning )I shocked the pool with Leslie's Power Powder Pro, 73% Calcium Hypochlorite.My measurements at present are off but, every year I open the pool it takes me a few days to get them under control. My question is, how many gallons of bleach do I need to introduce to the pool and and what is the PPM increase per gallon of bleach to a 15k gallon pool