Review on π Optimized CNZ Air Driven Biochemical Bio Sponge Filter by Cynthia Bennett
Works great for such a low price
Got this as a fallback. I wasn't sure how well this would work, but wow. Dirt that comes out when I squeeze it out in a bucket after changing the water and it's black. I use it for ten gallons. Most of the time I use it as the only filter, then just before a water change I shake the tank, put in a small mesh filter to get it all out, and after the water change I take out the mesh filter. I was very surprised by this cheap little thing. - You will need an air pump and an air hose.
- High marks for support and durability from testers
- Not as thick as other options
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