k1,
I'd love to see a few pics of the filter system and plumbing. I too have a remote 80 gallon sump/refugium/skimmer.
I built my own nielsen reactor. It's about 6 feet tall, uses a powerhead to stir the kalk, and an electric float switch drives a T1 titanium pump that adds RO/DI into the reactor and keeps things pressurized.
I am curious, since kalk is so good an improving skimmer efficiency, has your water become too clean for some of the DOC demanding corals?
I have a 90 gallon softie/shroom/polyp tank, and a 110 SPS tank.
Please post some pics of the guts of your operation, thanks
Snapper