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The schuran media has far less surface area due to the larger pieces; I guess this is to keep flow in the reactor going. It's probably going to take more CO2 than you're used to using to get the ph down. Plus, if you're then pushing the effluent through a tube of ARM, the effluent exiting that tube will have a much higher ph. You mght try two things: 1) test the effluent ph as it exits the first tube, and I bet it's pretty low, and 2) test the dkh of the effluent as it exits the 2nd tube, and I bet it's pretty high. If your tank dkh is 8-9 and the ph is nice and high, what's the worry?
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