this tunze calcium dispensor that i am using is a plain two plastic bottles that i attached to each other...u hook them up with ur tunze auto top off which than feeds water through it slowly to ur tank...u dnt mix kalk in that bottle...because the water feeds so slowly through kalk power that the kalk power sits on the bottom and dosnt sink to ur tank...
what i do is i put 5 tsp of kalk in that bottles every time i replace my 5 gln auto top of water..which last me about a week







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