This is probably a dumb question. My husband put up our above ground pool and we filled it. It’s a little off level. Do I measure from the bottom of the pool liner to the top of the water line OR from the top of the waterline to the top of the frame? If I measure from the bottom of the liner to the top of the water line it is only 1 inch off from highest to lowest point. If I measure from top of the water line to metal dean it’s about 2 inches off. Which is right?