I will be using our usual pool closer this Sept-what do I need to do before hand with the BBB method? This is my first summer with this method-should I increase my chlorine the week of closing and tell them not to any any additiona chemicals? Also, next spring when they open the pool, should I say "NO Chemicals" or check my CYA first and then decide. I had to drain due to high cya which I can thank years of pool store advice for. I'm more concerned about my closing for now and any advice would be appreciated.