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I use the same stuff. For me I just add it to my top off. It's the best Kalk that I have used thus far. Mixes easily and dissolves faster than other brands
How big is your ato? I use 1tsp per gallon
Use kalk in your ato...works for me.
You would need to dissolve the calcium media like @ecambero mentioned in order for it to work. If your going down that road you're gonna need a calcium reactor