Last year, we had a pool maintenance guy open our pool. He came in March and turned on the pump, but left the cover on. Then, he didn't come back until mid May to take the cover off. This year, we are opening the pool ourselves. It has been so cold this spring, there is no thoughts of swimming yet. Is there any reason to turn on the pump early, before we actually take the cover off? I am thinking of ignoring the pool until it warms up a little more in a couple of weeks. But, I am not sure if I should go ahead and turn the pump on and open everything with the cover on. What is the purpose of doing that? Thanks!