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The 4L of Matrix is about 12".
I've got this on a 220gal. (roughly) system. My NO3 is topping out the Salifert test kit. I also just hooked up a RDSB as well. I don't care how my NO3 gets down, just as long as it does. :)
The reactor is 6x20 with a Mag 2 asthe recirculation pump, flow bottom up. I have 4L of the Matrix with a few inches of the LSM sulfur. I added the effluent line out the side instead of the lid so I can vent out the top without touching the effluent rate.
I tried to gravity feed my reactor and it didn't work well at all. Not sure why, but i'm running it now (feeding it with an aqualifter pump) in a bucket to hopefully cycle it there and then move it to main system.
It ran for about a week at about a drop a sec. and never saw the effluent putting...