Plus, dripping kalk can become a headache when the hose clogs up, or when you have to mix up new batches of kalkwasser all the time, etc.
I used to drip kalk from an Aquadoser, but hated doing it so much that I switched to B-Ionic for Ca/Alk. Now I'm exploring the options of a calcium reactor and/or a Nilsen reactor.
I don't have experience with an MRC Ca reactor, but I do have one of Andy's skimmers and am very pleased with the quality. His dual calcium reactors are at the top of my list, but I've also taken a liking to Barr Aquatic's reactor. Also, look at Reeftek's reactor and the Geo's Reef reactor.