This will be my 3rd summer as a pool owner. 20x40 concrete. Probably built in mid to late 70's. Last summer we started losing a lot of water. We were having to run the hose in pool for about an hour each day just to keep above the skimmers. We have done the food color test on all returns (have slight leak in one return) but ... the bottom of the skimmer baskets have dropped. One of them is considerable. It looks like the concrete that was at the bottom of basket has just slowly deteriated and left the dirt exposed. The plumbing pipe is probably two inches above the dirt. and yes it is dirt with a little gravel/concrete feel to it just below the dirt when you stick your finger in it. I have some pictures but it says my file is too big to post. I need ideas/help/suggestions on how to solve this problem. It seems that if we replace concrete and level out the bottom of basket and then maybe epoxy over - that we will be okay...?