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Thats not my understandingAdding kalk to an ATO container is better than nothing but still not ideal. Kalk will separate from the solution over time. You need to find a way to keep the kalk in suspension in the mixture. Most people use a simple mixing pump. Mine has to mix for 15 minutes every 3 hours or Kalk is not properly supplemented into my system. Keep in mind that this time frame is used on a Kalk Reactor, which only doses the water at the very top, where it is least saturated. The mixing pump is a key element to safely dosing kalk.
from The Degradation of Limewater in Air by Randy Holmes-Farley - Reefkeeping.com
Limewater can lose potency by reacting with carbon dioxide in the air, forming insoluble calcium carbonate. Since calcium carbonate is not an effective supplement of calcium and alkalinity in reef aquaria, the limewater can become less useful through this process. The rate at which this happens in large containers, such as plastic trashcans with loose fitting lids, is much less than many aquarists expect. There is, in fact, little degradation under typical use conditions. Consequently, the dosing of limewater from such large still reservoirs can be just as effective as dosing using any other scheme, and may have substantial advantages. These advantages include simplicity of the system and the ability to use organic acids such as vinegar to boost the potency. The use of a reactor to dose limewater has the advantage of requiring less space, but does not have the oft-stated advantage of eliminating degradation by atmospheric carbon dioxide that is reported to plague delivery from reservoirs.