Rather than repeat what I've been told without quite understanding why it should be, I asked in the Reef Chemistry forum about these statements: 1. Dripping kalk may cause phosphate to precip out, and putting it right over your skimmer intake might help you bail some out; [generally good for corals] and 2. dripping kalk may cause mg to precip out. [can be a fixable problem for maintaining alk/cal.]
The initial respondent says yes, to a minor degree. The thread link is:
http://archive.reefcentral.com/forum...readid=1181767