WE set up our pool this weekend. I checked the level on every bar around the top. And leveled all the legs in both directions side to side and back and forth. We have about half the water in it and one side has sunken a little. It is about 3/4 to 1 inch unlevel. Is there some tloerence on how far out of level it can be before it is unsafe? Should I be concerned or can I fill it the rest of the way?