We only have 1 skimmer and 1 return jet. Apparently, there is a main drain but the previous owners kept telling us "there is no main drain." There is a drain but it looks like it has been plugged.

There is about a 6 foot concrete deck all around the pool. I have no idea how the plumbing is done under there.

I am taking care of the pool b/c my husband works long hours and really just doesn't have time to mess with it. I am also taking care of 4 kids (7, 4, and 2 year old twins) so I don't have alot of time to really try to find this leak.
I wish I did and I wish I could do this myself but I am just overwhelmed by it all.

But, I have noticed that there is a PVC pipe sticking out of the ground over by the filter....the backwash pipe leads into it. Anyway, you can look down in the pipe and it intersects with the main sewer line from the house. I can see water constantly dripping down there and at times water is flowing in that pipe. I have no idea if the pool plumbing connects to it underground but it seems like there should not be water dripping/flowing down there if water in the house isn't running. Any thoughts on this?