For me, I mix 2 tablespoons of kalk to each gallon of water and drip into the sumps of each system nightly. I replace ALL my evaporated water with this. If I need extra then I use Randy's DIY mixes.
Kalk replaced calcium used by corals from the water, and, while it will boost pH, especially if added too fast, it does not boost alkalinity.
What it does do though is keep the alkalinity from being used up by kicking the pH a little with each addition.
I let my kalk mix sit about 24 hours and siphon off the fluid between the top crust if any, and the bottom settlement which contains precipitates and undissolved kalk.
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