Well, I can speak Dutch to Germans and vice versa and most of the time we will understand 50% of what's being said. Only different thing is that Germans use faar to much verbs in one sentence.
Not sure, but I recall seeing Schwimming Pool in a German book I had. How easy can that be =P. Also Schwimmbad and Zwembad don't differ that much in speach, Schwimmbad is just Germanized! (or is it Schwimmbat or batt?)