TDS meter reading

amsirmans

New member
Could someone tell me in laymen terms what exactly a TDS meter is reading and what the acceptable reading should be? I know it is used to test RO water, what what exactly is it testing for? Is a reading of 0.06 good?

Thanks!
 

kentlighting

New member
its reading the Total amount of dissolved solids per million parts of water. so if your tap water reads 200ppm tds thats for every 1,000,000 particles of water 200 of them are not water. on the output side of a RO/DI system you preferably want 0TDS but anything under 1 is generally accepted as OK
 

Frogmanx82

New member
I think it is actually measuring conductivity and translating that into TDS based on conductivity for the typical sodium, calcium, mag values found in water. It is not reading things like silica or co2. I'd prefer if we had a direct readout of the conductivity rather than the tds translation which is not necessarily consistent from meter to meter.
 

kentlighting

New member
"I'd prefer if we had a direct readout of the conductivity rather than the tds translation which is not necessarily consistent from meter to meter. "

well anything that is using an electronic probe is reading conductivity in some form or another......
 

Frogmanx82

New member
"I'd prefer if we had a direct readout of the conductivity rather than the tds translation which is not necessarily consistent from meter to meter. "

well anything that is using an electronic probe is reading conductivity in some form or another......

Yeah, so why the conversion to TDS. I think something is lost in the translation.
 
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