I’ve closed and covered my pool today . It was very sad lol. I was plagued with brown looking algea dead or alive coming out of my sand filter . After I disconnected everything and covered the pool I looked inside the filter . I forgot to take a pic but it looked like chunks of chewed and stepped on bubble gum. Their was a descent amount on top and about halfway down. I’m sure this was the stuff spreading into my pool . Any idea what it was ? Anyways I emptied all the sand. Rinsed out the container . At this point should I just leave it inside for the winter ? I do have the bags of sand. I dont want to hook the hoses back up until next spring . Would you do the sand now or leave it till opening ? And what was the gummy looking stuff ? I assume dead algea