Re: only male fry

[Mike & Diane Wise <apistowise@bewellnet.com>]

Of course you are correct, Lee.  That is why I wrote, "At low levels of 
total dissolved solids, 1 ppm TDS "roughly" equals an electrical 
conductivity of 1µS (microsiemen)." For almost all intended purposes in 
the soft water end of the hobby they can be considered equivalent. If 
you look at common inexpensive aquarium conductivity meters there is no 
difference in range between those measuring ppm TDS and µS/cm. They are 
the same instrument reading the same values. It probably would have been 
more accurate to say that 1µS roughly equals 1ºdH.

Mike Wise

LeeH920226@aol.com wrote:

> 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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