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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”

Posted in Poly Filter, Water Quality