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>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. ;-)
Well, actually, we ARE willing to admit it, but that is not what we
were talking about... "crystal clear" (or even just "clear") means
'transparent, free of cloudiness'. Clear does NOT mean 'colorless'.