We bought our house with pool already installed. It did not have a pool slide but looks to have been "plumbed" for a slide. There is a skimmer cover located at the deep end side of our pool that when you take off the cover, you see a 1 1/2" water pipe staring at you. When we look down into the pipe, we see what looks to be a lightweight plastic flap-like cover that can lift up but closes after it's let go. It doesn't stay open on its own. We want to install a slide but don't know how to get the water to come up out of this pipe. We have a paramount floor system that makes the return water go to three wall jets on one side of our pool, then to three other wall jets on other side of pool (this is the side that the slide water pipe is on), then to the three floor returns, separately. We don't know how to get the water to come out of the pipe for the slide. Right now, we don't seem to be "blocking" any water through any of the paramount ports. Don't know if there's a switch or valve somewhere that we don't know about that would activate the pool plumbing.