Replacement Poly-Carb filter cartridge for Fluvals U series of internal filters. The polyester side filters out fine debris and contaminants. The carbon section filters out harmful liquid substances from the water, such as colorants or toxins. It effectively produces crystal clear water and reduces odours and water toxicity. It is worth noting that the carbon will also strip out most fish medications and treatments so you should remove the carbon if you need to treat the fish for any illness. The filter cartridge helps reduce overall aquarium maintenance. These cartridges should be replaced approximately every 4 weeks, each pack contains 2 cartridges. Sold in 3 different sizes for the U2, U3 and U4 filters.
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