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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.  ;-)