I closed my AGP last weekend. This has been my first season of pool ownership. I've had a great summer with the pool using the BBB method. I balanced out the water properly, brought it to shock level, and added algaecide prior to closing. My concern is with the water level. The pool store insisted that I should not drain any water from the pool prior to closing. They insist that I could damage my pool if I lower the water level. As part of my new pool purchase, I was supplied with a cover for the skimmer that fits like a tupperware lid as well as a plug to put in where the return outlet is. The water level was just a tad under halfway up the skimmer opening. I took their advice (which is a document they provide) and closed the pool. Cover and cable lock are on and I used the shrink wrap material as an additional protection against the wind. Pump and filter all are stored in the basement. Now that its all closed, I'm second guessing whether I should have taken their advice or drained the pool below the skimmer level. Have I made a mistake or am I ok with my closing?