CarlD
I keep thinking of getting a peristalitic pump and a timer. A rate that would add about 1-2 FC/day would probably keep it VERY clear.
My thoughts as well. I can get one from work that is 12v. My Cl demand at this time is 2 cups per day. These pumps are very good at accurate delivery so set it to deliver 2 to 3 doses per day with a timer. Since it is a peristalitic type pump back drain is not a problem you so could add a Y to the pump plumbing and feed directly in to the return line. The peristalitic pump is DC so you could vary with a variable resistor or timeing for delivery volume.
I looked at the Linux thing and seemed a lot of work and little pay back. You still need to test so why bother. If it provided for a Cl dilevery based on Cl level I may be inclined to build it but if I am gonna test each day its not too hard to turn a knob to vary delivery.
Steve