With some research, I see that the formal title of the procedure is "HARDNESS (0 to 4.00 mg/l Ca and Mg as CaCO3". Am I right in that 1 ppm = 1 mg/l? if so, why would a total hardness test only read to 4.00? I hope this doesn't sound too rediculous....


Justin McLeod
If you don't know where to start, go back to the beginning.

jmcleod@thepondguy.com
http://www.thepondguy.com