Back into the basement for further adventures in plumbing this afternoon.
Happy to report the seep on the cold water side of the water heater has stopped as I suspected it would ...
Got a call back from a driller in western PA up around Meadville. Nice guy, spent about 1/2 hour on the phone talking to him. Doesn't do frac'ing or know of anyone that does. Nonetheless it was a productive conversation, got some idea of the variation of strata he works in where he's at (mostly shale) and the variability. Also happened to mention that he doesn't hold a license for the State of Ohio ... something I overlooked when I started looking for frac'ers in PA.
Started disassembling the plumbing that went into the softener, managed to unscrew housing on the unknown mystery device which contains a consumable cake which is supposed to prevent scale build up in the pipes.
Once I had it off I found a label on the backside announcing it's a ScalTrol:
Best Filter for Hard Water: Purify Your Water Instantly | Scaltrol
Interesting concept/system - from the FAQ on their website:
Might partially account for why there is so little buildup in the pipes.
After that I went on to trying to unscrew the housing on the pleated filter. Not much luck with that, really tight.
It uses a plastic wrench that fits over the housing. Wrench is fairly flimsy and I have broken them before by torquing on them too much.
Time for Round 2.