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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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