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Homeowner baffled after washing machine uses 3.6GB of internet data a day
(www.newsweek.com)
This is a most excellent place for technology news and articles.
Not a washing machine technician but I guess an optical sensor measuring the light permeability of the water (over time) should do the trick. Similar to a smoke detector. But I guess weight is a thing as well.
That makes sense, wouldn't be that complicated that way.