🚀 go-pugleaf

In article <1992Oct14.031021.22383@javelin.sim.es.com> krogers@javelin.sim.es.com writes:
>I'm not suggesting, I'm reporting.  There are many kinds of "hardness"
>which are measured.  The term is applied to any practically any
>disolved substance in water.  Here's a micro coredump of what is
>important for aquarists as I understand it.  It may not be entirely
>correct; others are welcome to throw in their input.
>

This is the main confusion.  I believe that everything that Keith writes
is indeed accurate.  His terms are correct as far as I have been able to
establish.  Part of the confusion comes from the water analysis people 
who like to use CaCO3 equivalents because CaCO3 has a nice molecular weight (100).
This also leads to confusion since some people (especially in salt water
aquaria) will talk about Ca++ concentrations, and most test kits are calibrated
to read in CaCO3 equivalents.  This is a very frequently asked question, and
I believe that Keith's reply should be added to the FAQ file for the *.aquaria
groups (I have seen at least a dozen discussions on related issues in the 
past year).


Good Job Keith



--
Gilbert Lee Huppert (glee@athena.mit.edu)
Materials Etching Technology Laboratory