My tank depletes about 1 DKH of Alkalinity daily so the Ca reactor needs to keep running. If nothing was done from the time when I received the first error message the tank could conceivably drop to 3 DKH by now. At that level things likely would start dying. Another way the Ca reactor could crash a system is what happened a few years ago when the tank sitter bumped the dial on the CO2 regulator and emptied 20lbs of carbon dioxide into my tank/basement. CO2 will displace oxygen and acidify the water, both are deadly conditions.
While I may be the only one with a complete understanding of my system that shouldn't have been a problem in this instance. The error messages from the Apex have kept me informed with exactly what was going on up until the tank sitter started to pull apart things. All I needed them to do was turn up the CO2 slightly, and when they turned it up too high: turn it down slightly. However I should have quantified how much 'slightly' is, that was my fault. For the record: no flow is not enough, a torrent of bubbles is too much, almost anything in between would have been fine but 1 bubble every one or two seconds would have been optimal.
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