Bob,
My wellwater has a lot of calcium carbonate, high PH, limestone rock, and very, very hard too, but it's the iron in a dilluted state that gives it that green color. Once the iron settles it's crystal clear. When I first fill a pond for the year it's brown, then it's dark green, then light green, then crystal clear.
I don't doubt what you say at all Bob, but this is what causes the green in my area vs. later when an algae bloom is the cause.
I've also see a lot of literature that explains the green color due to iron.
And I've seen glacial melt water that is rich in clay and silt particles that has a cloudy green color to it.
Last edited by Cecil Baird1; 04/06/08 10:44 AM.