Question concerning kalkwasser

[puddlefish]

What is it, exactly?

 

[gcvt]

Hi puddlefish and welcome to AC!

Here's a few kalkwasser links you may find helpful:
http://www.simplifiedreefkeeping.com/faq/17.htm
http://www.aquarticles.com/articles/saltwater/metelsky_kalkwasser.html
http://www.automatedaquariums.com/kw_how.htm
http://www.petsforum.com/personal/trevor-jones/kalkwasser.html
http://www.aquacare.de/meer/info/themen/e_kalkwa.htm

 

[JustPhish]

Pretty much calcium hydroxide