Well...the real answer to your question is that you only want to add enough to maintain your Ca/Alk levels.
If you find that you need to put that entire 2L into the tank every day just to maintain levels, then your answer is to add it slowly enough that it takes 24 hours to drip completely in...which would be 83ml/hr.
But if your tank uses less Ca/Alk, then you might need to put that 2L in over 2 days or more.
If you aren't measuring Ca/Alk, then STOP!!! Don't start adding Kalk unless you know what your Ca/Alk levels are and that you need to supplement.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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