Thanks for the replies.

The pool leaks when it is running and when it is not. It is leaking faster when it is not running.

I kept it off for a 48 hours and it leaked down to the returns and then I filled it back up to run it off the main drain to keep it from getting too dirty. So I don't know if it would have leaked further than that.

No leak at waste line.

I haven't had any work done recently. Had a tile and coping job 2 years ago. Everything fine after.

However, I have had the spa return start bubbling when pool is off, like it was sucking water in. However, when I did the dye test, it did not suck the dye in thru that return.

The sand filter is higher than pool and is 2 year old Hayward.

I did have a crack in my skimmer when I opened my pool. I sealed it with marine putty and I don't think that is it as it is way above where it is leaking down to.

My pool is about 30 years old.

Anything further I should test?