I have a few problems...I just open the pool yesterday and noticed some bubbling noise at the top of the dome on the sand filter, also appears to be a drip coming from the connection from one of the pipes from the filter to the multiport housing, and a leak at the connection on the return pipe (?), it's the pipe that goes on the back side of the housing. Just inherited this house last year and not very experienced with this pool yet. I had some air bubbles coming out of my jets last season, fixed that problem and now I have more. Also PSI is normally at about 18, is this normal? I'm thinking maybe I need to replace the sand, I'm not sure just how old it is. ANY help would be greatly appreciated. FYI, 55 YO woman with no man to help.