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A cistern 16m diam 20m high with "white water" eg. mostly water shakes to the level that humans get worried. Anybody seen that? So far opening top hatch makes no change, Only happen when in and out pumps, level holders are running like a few 10ths cubic meter per hour. Can they make the water rotate? Freq. so far unknown. 
Good Vibrations since early 1950's, first patented vibrometer 1956 in the US.
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