fhorst,
I see you're in a 50hz country, so the pumps specs are no doubt differant.
In the US, a 60 hz county, the MD20rlzt has more head rate than the dual Swiftys will give, and more flow as well.
Both the Swifty 600s and the Iwaki MD20rlzt are very good quality pumps, dependablity should not be a issue with these pumps.
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