This is interesting.... I used to be a software engineer at sims deltec in MN.
I actually use the CADD Prism 6101 to dose my kalk and it is the perfect product. I have no idea where a person can buy these things as I got mine from the "back room" I know at one time they cost upwards of $3000.00 usd
My reefing friends all want one. My pump is 6 or 7 years old and works still runs like a top.