A measurement of water from the drainage of a plant shows 63,000 ppm, with a healthy plant and with readings of a similar device from another manufacturer of 2,000 ppm. Measurement of purchased bottled water 500 ppm (by the way, 500 ppm is no longer potable water) (TDS-3 measures 160) From cooler ppm 300 (TDS-3 measures as 50) In general - do not recommend, returned the goods to the seller
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