[APD] GH versus PPM

["Tom Wood" <tomwood2 at flash_net>]

According to this site:

http://www.appslabs.com.au/CD97.htm

My TDS meter uses a 0.5 converion factor to translate micro-Siemens into 
TDS. So my current reading of 170 TDS is actually 340 micro-Siemens.

According to this site:

http://www.fishdoc.co.uk/water/hardness.htm

I want between 100-300 mg/liter CACO3 for goldfish.

How do I translate micro-Siemens into mg/liter CACO3?

Thanks,

TW 


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