I dosed kalk in my ato for quite a while. I have the JBJ ATO with an aqualifter pump. I set my resevior at a hight that allows it to drip once per second. That way it can't swing particularly fast. Obviously won't work if your evaporation is higher than that. But even you should still be able to find a speed that works for you but isn't too fast.
I have had the float valve stick but its not really an issue. At the speed the pump runs at it times out after 20 minutes which is before it can over dose the tank. Of course then the ATO is dead until I get home and discover it but at least there is no tragedy.
Kalk does build up in the water line and pump but that just requires a bit of maintenance to keep things clean. The pump is cheap enough as it is but when mine quit it only needed to be flushed out.
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72g bowfront, t5.
29g JBJ nano cube, ATI 26HD.
Livestock: clown fish, chromis, coral beauty.
Corals: Toadstool, maze brain, candy cane, mushrooms (purple & green hairy), button polyps, green zoas, GSP.
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