I drip kalk two different ways. One is with a Tom aquatics aqualifter conected to IV line with a roller clamp.
On my frag tank I gravity drip from an IV bag with a roller clamp. At one drop every 3 seconds I top off with RO depending on the humidity. The kent Marine doser would work fine. Kalk tends to settle on the bottom of any container you put it in so you have to flush the tubing once in a while. Everytime to refill the settled kalk will be mixed up.
Sorry for the big pics