As documented at OCAU, the original WW had 1.0mm wall and channel widths, and 4mm high channels.
The original had a 3.5mm wide nozzle slit. I had experimented with 2.5mm wide nozzle slits at my end just prior to releasing the WW back all that time ago, and found no noticable performance increase with a given pump, which at that time was either an Eheim 1048 or 1250.
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