I have a unique question. We have an indoor, in-ground, 20X40, 3ft to 10ft deep pool that was probably built in the 70's. We filled with water last year but after 3-4 weeks, it ran dry. In brain-storming ideas, is it possible to fill the deep end with mason sand to level it, and install an above ground pool (which would relatively be sunken into the ground) into the hole that is already there? We would then do the cosmetics to complete it. HELP!