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These filter foam holders are designed specifically to fit the OASE BioTec® and OASE BioSmart® filters.
OASE has had three generations of gravity filters. Gen 1 was the BioTec 5/10/30 filters. Gen 2 was the BioTec 5.1/10.1/12 filters. Gen 3 is the Biosmart 5000/10000 filters.