In a message dated 5/2/2002 6:01:07 PM Pacific Daylight Time, 
[email protected] writes:


> 
> I know they say that the prills add nothing to the water but that is not 
> true.  I started with R.O. water at 6 ppm TDS and wound up with water at 
> 83ppm TDS or about 1/2 the TDS of our municipal water which is at 170 to 
> 190 ppm.  
> 

Please, what is TDS?