When I bought the Tunze 6105s a few years ago they only lasted maybe 6 months, and the shafts came loose. J&L replaced them under warranty. Now I just had the shaft corrode off one of the Tunze.
I've been running a Jebao RW-15 in my frag tang and quite like it. Although it's a little noisier than the Tunze, it also puts out more flow. Switching to 2 RW-15s for the display, hopefully they are more reliable than the Tunze!
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