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kalk and lime water are the same thing. kalkwasser is the german word for it. it will help to maintain your cal and alk but will not add alot unless you get a huge one which can get cost prohibitive. if low ph is not an issue i would say go with that. two part is a good thing if you can find a cheap source of calcium but as those sources dry up a cal reactor is going to be your cheapest option for keeping up with these demands. i have about 220 gal of water volume with a tank full of hard corals and i dose about 1 and 1/4 cup of both each morning with an undersized kalk reactor. with that i am able to keep 440ppm and 10.5dkh with no precipitation. are you adding both parts in the same area? do you add them at the same time?
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