To answer the original question. If mixed directly together, or close together, the calcium and alk solutions will precipitate and form a solid mass in the water.
The directions on commercial products will tell you to add them seperately, but that doesn't mean hours or days apart. When I first started in the hobby, I once added both together in a low flow zone of a customers sump. Bad Idea. . . I learned quick and haven't done that again. It formes a solid white mass on the bottom of the tank that took weeks to disappear.
What I typically do is add my calcium solution to the overflow of my tank, wait a few minutes for it to disperse quicky through out the tank, then add the alk solution. I never get precipitate this way, and paramaters stay stable. 8-10 minutes is plenty of time between the two in a high flow situation like your overflow. I'm impatient, and dare say that usually I only wait 3-4 minutes.
Hope this helps.
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Akira wrote:
