Underworld Polyfilter Standard Size

This is a specially patented medium that is trusted by aquarists around the world for chemically filtering and purifying fresh and saltwater aquaria. Its unique colour-changing ability will vividly illustrate what impurities have been removed from the water column. Unlike activated carbon, once the impurities are bound, they will not be released back into the aquarium even when the polyfilter is exhausted. Polyfilter will remove excess nutrients, toxins and is ideal for copper removal from marine tanks.

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