These pre-filters are amazing and inexpensive, but their porosity is low and you have to rinse them out when they get clogged. I will say that clogging varies from tank to tank depending on the occupants of the tank and the feeding. I was able to get rid of bacterial blooms by adding the beneficial bacteria they offer.
π Enhance Aquarium Water Quality with Fluval Carbon Filter Media
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π Fluval Zeo-Carb: Highly Efficient 150 Gram Filter Media for Optimal Aquarium Water Quality
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Tetra ReptoFilter Cartridges Whisper Technology
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