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Rather than using a machine, go to one of the stores that has a live person on staff like Water & Ice. They always have a conductivity or TDS meter handy and are happy to test the water for you. The problem with unmanned machines is there are no health codes requiring any sort of maintenance or standards that have to be met. Some of the manned stores sell ice cream and have soda dispensers so they are subject to health codes of sorts. The water may not have to be xx TDS but at least you know there is some sort of sanitation being practiced. I have found the Water & Ice by me to have great quality water every time I take my TDS meter with me. Our tap water TDS exceeds 800 and their RO only is always in the 13-17 TDS range which is remarkable considering the quantity of water them make in a days time.
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