I have a vinyl lined, DE filtered, inground pool that is probably at least a decade old (not sure of exact age or volume).
Since last year, one of the return jets has been blowing some sand into the pool and this year, I've noticed that the water has been draining somewhat fast (maybe an inch or so per day). I don't see any visible leaks in the liner so I've manually plugged the 3 return jets (including the one blowing sand) to see if that stops or slows it. The water is already below the skimmer basket that is not the problem.
I'm still waiting to see if plugging the return jets stops the leak but I have a few questions.
1.) I have 3 total return jets and the one the farthest from the filter is the one leaking sand. My hunch is that this is the one with the leak. Could I leave just this 1 jet covered and still run the filter or will pressure build up and cause further damage?
2.) If the leak is in an underground return pipe, will I (either myself or hire someone) have to dig up the ground and break stone to fix the pipe? There is about a 3 feet wide area of stone around the entire pool and beyond that is grass - I'm hoping they could just dig underneath the stone if they had to? If not, how else could this be fixed?