I am also partial to kalk. its been good to me in the past and its cheap.
Send me a PM if you want a bit to start yourself off, free, but you have to bring a container for yourself. If you want to do your Ca. another way, you can look at liquid additives as well. There are LOTS of brands for pretty much anything. Liquid though can be made expensive by adding water and charging based on weight.
Do you know what your Ca. and Alk. are at?
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