See this for hardness -
https://srac.tamu.edu/index.cfm/event/getFactSheet/whichfactsheet/112/

See Chapter 3 Physiochemical Characteristics of Ponds in the new book Small Impoundment Management in North America. Claude Boyd is a master of explaining the subject - the best I have read.


Last edited by ewest; 02/03/13 09:13 AM.