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Re: only male fry

In a message dated 12/2/03 11:32:56 AM, apistowise@bewellnet.com writes:

<< TW I think there was a typographical error in the answer you received 

about ppm. At low levels of total dissolved solids, 1 ppm TDS roughly 

equals an electrical conductivity of 1µS (microsiemen). 1 mS 

(millisiemen), or 1000 µS, roughly equals 1000 ppm. It is not an unusual 

mistake on emails. Many do not know how to type a micron symbol (µ)  & 

mistakenly use an "m" instead. The use of an "m", of course, represents 

"milli" in metric units. >>

No, the TDS in ppm does not equal the conductivity in microsiemens/cm. The 
relationship is variable depending on the exact composition of the dissolved 
ions. It ranges from 1.5 to 2.0 /1 Conductance/TDS. Most common water supplies 
are at a 1.7/1.0 ratio.

Lee Harper
Media, PA

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