Previously I used the airhose on my MTT1 (venturi) to draw daily 5 liter Osmosewasser. So yes, it works to keep saltcrusts away. Against Kalkablagerung it will probably help too if done on a daily basis.
Currently I am using the DC200 with RD3 and since the airhose is not easy to pull out I haven't tried it yet on this type of skimmer (needle-wheel).
