this year my problem is a leak at the pvc fittings at the jet outside of pool dripping slowly until turn on filter then it leaks quickly. We have lowered and raised the water several times first to get new fittings cause we thought they were weathered, then to tighten them each time still leaking. When we looked in between the walls of the pool when switching out the fittings we noticed water in between the walls. Do we have a thread leaking issue or does it sound like liner leak? Pool is completing filled with Algae this opening season also. I think my new pool cover may have leaked maybe.