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Poly Filter

This piece of Poly Filter turned light brown (light brown sugar) after a few days.  Basic water tests show no ammonia, no nitrates prior to use.
Cross-section shows color all the way through.

How long should it last?  Some reports say a few weeks to months or until it turns black.  Waiting to hear from the manufacturer.

Majestic Aquariums says, “Yes it goes brown quick, replace when black”

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