Thanks for the info, I'll give it a while to break-in.
Also the readings vary depending on what the set point is at. The instructions say to take the readings with the set point cranked all the way up.
I get 165 with it cranked up and 48 with set point at the lowest. This is with the selector switch in the reading position. Does that make sense?
Also, after a ton of searching I finally found a reactor for pretty cheap.
It's 22 inches tall and it looks like it comes with same shredded plastic media as the MTC.
http://www.fishkeepers.net/pondconne....php?ID=204598
They are drop shipped from
Aquarium Life Support Systems
They don't take Canadian credit cards, just cert. checks or money orders.
I'm going to run the output through a Phosban reactor filled with carbon.