Thanks for the suggestions, including the gem tangs.
Tonight I wired up my first solenoid. I even had the right plumbing bits to get it hooked into my RO lines. It works just dandy, though I need to enclose it since I have 120V of control sitting there a little more exposed than I'd like.
I'm excited about plumbing my auto top-off. I have a right "fancy" setup that shares these goals:
a) produce RO/DI in big chunks instead of little ones to preserve the membrane,
b) auto-fill two reservoirs -- one for salt and one for fw top-off,
c) auto top-off into the main tank,
d) auto stir/mix/aerate the sw when it is time,
e) deliver either reservoir to the tank at high speed for changes.
I think I've got it down to
1) two reservoirs
2) three float sensors in the reservoirs
3) one peristaltic pump
4) one computer controller
5) one solenoid valve
6) one distribution manifold
7) some magnets to mount the sensors
8) a bunch more plumbing :eek2:
I'm still assembling parts and my schedule continues to look poor for long-term free time. I have a wedding to attend this weekend and then will be out of the country most of next week. Then four days gone the next week and going the entirety of the week after that. Sigh.
Ben