So...After reading all of the things folks were saying about leaks and how it is almost NEVER the lines themselves...the weak points are at the connections. So...I started digging and I found this.
Up until this point, I was losing about an inch of water in an 8 hr period.
I repaired it and now it looks like this
Now instead of losing an inch ever 8 hrs, I lost an inch over a 24 hr period...with some swimming done today. This still seems like a lot of water to be losing.
So after filling my pool up to the bottom of one of the skimmer screws. I plugged up both returns and the skimmer to see if there is a leak going on anywhere else.
Things that I do know"
The skimmer was replaced at some point.
If I leave the plug out of the skimmer, the water will drop into the skimmer line...without the pool being on.
I have no main drain...that was abandoned a while ago
that is also plugged with a black plug.
The original pool was built using black poly line.
The Return line in the picture is the return on the right hand side of the pool...there is also one on the left...that was also repaired at some point.
Both of these are tied to one line from my filter....located in the basement of my house.
being that the black poly is underground, I will assume that they are connected with a (T) type fitting...I also know that the pipes coming into the house..through the foundation wall are copper. ...so they had to go from black poly to copper at some point.
I do NOT know how deep the T connection is. The guy who built the pool 40 years ago said the return lines ran along or were embedded into the footing of the pool..whatever that means. ...so the lines could be 3 fee deep, could be 6 feet deep...dont know.
What else can I possibly do?
I am open to suggestions.