After reviewing the programming procedure for the DOS and automatic water changes, it does not appear to have any redundancy, and simply relies on the accuracy/calibration of the DOS system. What happens if either one of the pumps gets stuck in the on position? I've read of this happening with DOS and two part dosing. I guess you could use constraints from the salinity probe, but I am not sure how accurate it is. I know additional Neptune sensors can be purchased, but can I use the optical sensors already installed with the Neptune ATK? And then maybe add 1-2 more for even more protection?
DOS Automatic Water Changes and Redundancy?
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ca1ore
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You can use all kinds of different sensors to effect redundancy. I have both high and low floats in my sump that turn off the AWC in the event either is triggered. I have redundant in almost all my equipment.
Waters
"...in perfect isolation, here behind my wall."
This has always been a concern of mine as well...especially since my second DOS has froze many times, with only ALK dosing and no CA. Like you said, I use the salinity probe and nothing else. I usually try and make sure I am around when the water change starts to make sure both heads are turning.
