I have a pool with attached spillover spa. I have noticed in the last couple of weeks that overnight the spa water level drops about a foot to a foot and a half from the spillover. Almost all the way down to the jets. The pool is six years old and until recently the spa had always held the water level right at the top when the spa and pool were off for the night. Obviously the water is leaking somewhere.
My question is would it be leaking back through the plumbing into the pool? I do have some hairline cracks in the gunite but those have been there for years.