Hi I'm new to this group. I bought my home with an in ground pool and had no idea what I was getting into. There's not many pool people where I live so we had to figure this all out. We finally got it up and running and we are working on finishing the slide I was trying to figure out how the water goes to the slide and realized it can be through a hose or some type of piping to the return. There is this pipe looking thing under the slide with I think a hose connected. It has a cap on it and I'm not sure if that means the pipe is for the slide. Does anyone know what this is? Should I take the cap off? Any help appreciated. This is under our slide.