Review on Fluval C2 Replacement Poly Foam Pad - 3-Pack by Dawn Bias

Of course this biocarrier is exactly the same as the one that originally came with the filter and it really gets 5 stars for getting so much in the box. I estimate that this is enough for two full replacements of C3. If you follow the manufacturer's instructions (replace half every 6 months), a filter will last approximately 2 years. But I don't change mine that often. More than half a year. However, I add them as needed as the size of the media used decreases over time. because water flows 24 hours a day, 7 days a week