kalk question

[fishking]

what does kalk do, and how are these things http://www.marinedepot.com/aquarium_dosing_pumps_top_off_kent_marine_aquadose.asp?CartId=

[fishking]

bump

[sknoch78]

I used one prior to buying a kalk reactor. It works. For me, it was to much of a pain to keep up with the fluctuating evaporation rate in my tank. I ended up buying a kalk reactor and LMIII.