Rex,
Thanks for the link. I had read that before and is a good explanation of how alkalinity, hardness and PH are related but different.
Ag lime raises both alkalinity and hardness. I generally use alkalinity of 20 ppm as a bottom number to support a bloom. What is the bottom number of hardness to support a bloom? And is it possible to have a good alkalinity number and a low hardness number. It seems to me, that when you have low alkalinity you almost always have low hardness. But, what is that ppm number that will support a bloom.
