yea it says to calibrate with NaCl....it is a HM digital TDS-3....i got it on ebay... what would happen if i just kept using the high ppm water without getting a ROS...?/
Snowbdr1613 Reviewed by Snowbdr1613 on . THE PPM of my Faucet water is 760ppm!!! What do i do???Help I just received my tds meter and my faucet water is saying 760 ppm!!! What do i do??? I have a hydro grow in process right now and i dont know what i can do with such a high reading??? Someone please help!! Rating: 5