Success!
Thanks for all the help,
The tell was that it was coming out of the outlet side of the Jandy like a fire hose, and, at the same time, filling the slight window on the Hayward when doing so.
It was an obstruction in the outlet side @ the pool. Funny enough, there is nothing in the mega shop-vac... so I'm not certain what that obstruction is or was... and I don't think I care. LOL. There are no trees, etc. in the area... so... Yay.
Thanks again for the help... even the "what's a Jandy or a Hayward" comments. They made me laugh.
