Tunze Osmolator and Kalkwasser

I have a tunze osmolator as an ATO on my biocube. I was considering using this ATO water as a kalk dispender but have read it may be bad for the pump. That said, I can't really find other info. I have seen the tunze kalk chamber, which seems to just be a reservoir of super saturated kalk solution plumbed in after the ATO pump but before the outlet into the tank. I guess the question is, will pump life be significantly reduced if I just make the ATO all kalkwasser? is it worth putting the kalk in its own chamber? It seems like I could make one of these kalk chambers pretty easily out of an old nalgene bottle and some RO line pieces from Lowe's, but if it isn't necessary, why bother, right?