Well...from what friends have told me (I'm certainly no chemist...and depend on the likes of Randy Holmes Farley and others to help) which ever way you 'bind' the phosphate, it is put into a 'matter' whereby it is easier to skim. Most people report great differences in skimmer production when they drip Kalk. From what I've read, the kalk helps to 'encrust' or bind the phosphates and make them easier to be taken in by filtration.

Again, I'm just going on the word of the chemists, but did notice quite a difference in my Euroreef Skimmate production when I began dripping kalk. For what it's worth, I also lost every strand of hair algae shortly after beginning my kalk program.

Dave