wrote in message
ups.com...
I had a related question. I bought a HOB (wisper) filter the other day,
and on the box it claimed to remove nitrates from the water. I was
under the impression that nitrates could only be removed by water
changes, plants, or de-nitrification (usually in the substrate). Any
thoughts?


I find that in scientific circles, it's more important for the question
to be precise, rather than to get the correct answer which might mislead
you.

The correct question (imho) would be:
Is the amount of NO3 removed by this filter going to be significant in my
application?

The answer would then be (imo) *hugely* simplified.... no.
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