It used to work for laundromats too, until the feds started measuring water usage. In fact, I think it would be trivial to set up on a restaurant and be able to

It used to work for laundromats too, until the feds started measuring water usage. In fact, I think it would be trivial to set up on a restaurant and be able to do fairly close calculations about how many tables a restaurant does per night vs how many table cloths get cleaned, how much water gets used for washing dishes, electricity, etc. It makes me wonder if this method actually gets used anymore.