My understanding is that the TDS (total DISSOLVED solids) will not measure the colloidal particles as they are suspended not DISSOLVED but will measure the ion content. The PWT measures conductivity which would include colloids and ions. Regards, Paul kaselo...@aol.com wrote:please explain to me as simply as posible the difference between the tds meter and the pwt meter when testing CS... we have two tds meters, and they both give totally different readings... if i understand correctly, i need to invest in a pwt meter but i'm not totally understanding why it is better... thanks!
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