Jason
There are other salts ,chemicals & also a natural enzyme in K-balance that makes The K+ more uptakeable by corals.
Also not just for K+ but also MG or any other Ion you trying to supplement for your Reef I will stay away from adding too much of chloride based chemicals ,they will throw off your Ionic balance fom what it is in NSW
I will try to find the article on ADVANCE AQUARIST to post later ,you can also do a search on RC for it If you are a premium member
,unfortunately I am not ,so no search till late late night for me.