Trying to figure out a problem with my swimming pool. I just purchased the
house so don't know it's history much and the inspector did not catch
anything - sigh...

There is a drain at the bottom of the pool, and there is a "skimmer" on the
top. The skimmer I guess is connected to the filter and pump and the water
is returned to the pool via three jet heads.

Initially the water is right at the level of the skimmer, I then filled 4"
more water which took about 4 hours with a garden hose. The pump is running
and water is sucked in and pumped back out. After one day the water lowered
to the skimmer level again. I tried it a few times and same results.

I asked the pool expert out and he says "well there is obviously a leak in
your pool, why don't you hire us to patch it and resurface it?"

But he cannot pin point to me where the leak may be. Since the water is
going into the skimmer and it always lower to the skimmer level, it seems to
me there is a high likelyhood of the pool itself is NOT leaking, but the
pipes connected to it may be leaking, or may be the valve to the sewer drain
is...any idea how I can verify it one way or another?

Thanks,

MC