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I used two of these sponges on two of my PVC Pipe Aquarium filters for my thirty gallon. they keep the Aquarium as clean as any HOB filter would. If you are making your own Aquarium Filters: The Biochemical sponge foam replacement V3X7 is a great wY TO GO!
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I like them and sometimes put 2 together for a Large sponge filter. This picture is one in a 70 gal tank
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Sponge filtration is a passive form of aquarium filtration
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Nice replacement filter when the other filter is worn out.
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Not at all like the advertisment
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