I had the pool closed through a company this year. As far as I remember, he lowered the level below the return lines, and also put in plugs removed the pump etc. and also put in liquid chlorine. While the winter has been milder, there has been some rain and flurries. This might be a silly question, I have a mesh cover so I expect the water level to obviously go higher through the winter every time it rains. Are we supposed to lower the water level again? Or having the return lines plugged etc. is enough?