I have a kalk setup similar to yours: RODI reservoir, to ATO pmup, through failsafe solenoid, to kalk reactor, dispensing into filter socks at the front end of the sump. At first, I tried using it with the normal ATK programming. I found that the variation in topoff duration, amount of kalk dispensed , and acute pH change was just too great for my taste. However, as it turns out, my daily evaporation is ridiculously consistent. So I just reprogrammed the ATO using the OSC command, to dispense for 10 seconds every 30 minutes, which keeps my sump return chamber water level very stable and also provides a uniform smooth boost to the daily pH range. Nonetheless, I've got some safeguards and alerts also programmed in, which will let me know if a minor manual water level adjustment is needed.
Regarding the optical sensors: You need to have an FMM with an unused/available port in your system. Once you plug the OS in, the corresponding switch tile should be found in the Tiles (lock icon upper right) section; you can drag it to your dash if you want (not necessary though.) Now you can use that sensor wherever you might need to. Just as an example, if you want your skimmer to turn OFF if the switch is flooded (CLOSED), then add this line to your skimmer code: If [Switchname] CLOSED Then OFF. (I actually use this to keep my skimmer cup from overflowing.)
Regarding the DOS: I personally wouldn't use it for topoff duty, that's what a topoff pump is for.
I use a solenoid valve as well but only as a failsafe to keep the line closed in case the pump malfunctioned and starting going nonstop, or some kind of freak impossible siphon situation tried to develop. Think about what's in that kalk reactor, and no degree of extra safety is too much.
I also use a CO2 scrubber, and it works quite well. I tried an outside line at one point, it did nothing; CO2 scrubbing seems far more effective (which makes sense.) I only use it at night, and automated the changeover with a sweet motorized valve that I have Apex open and close in the morning and evening.
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