The reason I took some time to be able to do these recordings is that I wanted to have two piezo discs of the same make and model to build my stereo contact mic.
My kitchen has an inox sink. I attached the 2 contact mics to different points of the plastic pipe underneath the sink.
First water flows freely, then I put the plug in so the sink fills up a bit and then release the plug, emptying the sink.
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