Repost of what I posted before....
I have been using ReefChoice kalk and carbon for a little over 8 months now, not only are the products great but the price is right as well, I got a gallon of kalk for under $12. Dave is a good guy to sit and talk tank with, if you have any questions about carbon or kalk he will give you very good and detailed advice, his customer service is exceptional. If you get a chance, I would suggest trying some of Dave's products, or simply visit his website to see what he has to offer....ffaquatics
By the way, I use a home made kalk dripper.