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Chemical filtration
I think that a number of people on the list are in an advanced state of
denial as to what constitutes "crystal clear" or "colorless" water.
This is the test. Fill a five gallon white polyetheylene bucket with
water from your aquarium. If the water appears to be light blue, then
you are the proud owner of nearly humic acid free water. If it looks
just plain white, or yellowish, it isn't colorless.
That said, almost all successful planted tanks have some yellow color to
the water, whether their owners are willing to admit it or not. ;-)
Craig