I've also added a Calcium Reactor ($300). Been up and running for about 2 weeks. There have been several versions of it running since then, the regulator I received with the CarbonDoser unit was toast. So I ordered another regulator off of eBay($85). It arrived and worked well, had a solenoid and a needle valve that was really sensitive. But I couldn't stand staring at the CarbonDoser just sitting there like a worthless heap. After many, many, many conversations with
@jda123 I took a calculated gamble on another regulator off of eBay ($55). This one is a Victor-450B that I believe was originally for an Oxygen tank. The first bit of good news was the CarbonDoser screwed directly into where the needle valve was, no adapter needed. I did need an adapter to the tank, but that was easily found on Amazon. I still didn't really know if the CarbonDoser worked 100%...so I held my breath and turned everything on, and it is perfect! I have been adjusting the seconds per bubble over the last few days, and at 5 SPB I am getting about 24 dKh effluent.
I do have the Apex monitoring the pH, but I fall into the camp that doesn't really trust the pH probe to stay accurate without constant calibration. So my plan is to monitor the effluent as primary means, and Apex pH monitoring as secondary means.
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