After 2 gruelling beers worth of testing I have a few notes.
Tested using only 2 liters of zeo rocks and water supplied with a mag7. Pump selection would be dependant on reactor mounting height but something equivalent to mag5 flow curve performance would work for most cases.
The reactor works best mounted horizontally and I like it
.
When setup vertically one needs to rotate the unit back and fourth a little too vigorously and that's no fun. The rocks were more of a mix in size, larger and more angular then I expected therefor causing them to compact easily.
The swivel fittings and hose work well creating a sealed unit that can be wall mounted in unused areas saving space for other equipment.
When mounted horizontally the rocks tumble and mix nicely like a lottery number machine with an effortless slow rotation (approx 300deg.)
I am a bit of a liar by claiming vert or horz mountable and apologize.
Here's a few test photos,
