@Lou Ekus great thread to come across researching AFR.
I know there are still not a ton of ppl out there with it, but have you come across any reefers running GHLs KHD and IOND (or the Apex equivalent) and using AFR as the single supplement?
I ask because I wonder if there are ways to program the controller to dose more or less AFR depending on which element is not where it should be.
For example, if ALK is low, dose 5mL. If Cal is low dose 3ml. If both ALK and CAL are low dose 7ml (not saying those numbers make sense by the way, just used them arbitrarily as an example).
Also, given average consumption rates, about how long would a 1600g last on a 230g tank?