03-14-2012, 08:28 AM
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Activated carbon adsorbs impurities in the water column. It may be exhausted in as little as two weeks. How beneficial it is depends on the tanks water condition and the circumstances. It likely has very little value in a heavily planted tank as it steals nutrients from the water column that the plants would otherwise use.
On the other hand, the periodic use of activated carbon can be beneficial in some tanks.
I've heard John of Aquaripure say that with zero nitrates and perhaps the periodic use of carbon, a partial water change may only be necessary once every three months or so.
Purigen is a good (scavenger resin) product but it is very selective in adsorbing dissolved organic compounds so it will not address other chemical impurities in the water.
So I would say go ahead and use Purigen, but also consider using activated carbon periodically, particularly in the unplanted tank.