Hi guys. I've been lurking for awhile, trying to learn what I can, but I have a question about something I found on my 1974 20x40 pool. I have recently started the prep work for the plasterer to come in, which involves as you know draining and in the pool. It's around half full of water,
well if you can call it water. I am slightly nervous about popping the sucker up when I totally drain it. It seems like there is some sort of large diameter
access pipe alongside the one end of the deep end. I was covered with a slotted grate, which in turn was hidden beneath a deck around the pool. It seems to be filled almost entirely with dirt.
What is this thing? A sump to lower the water table?
If so how would I clean it out?