Instructions:. Do not replace a Bio-Wheel unless it is damaged since beneficial bacteria live on it.
100B (20 gallon aquarium) = 5 in L x 5 in W x 7.5 in H
150B (30 gallon aquarium) = 8 in L x 5 in W x 6.75 in H
200B (50 gallon aquarium) = 9 in L x 5.25 in W x 7.5 in H
350B (75 gallon aquarium) = 15 in L x 5.25 in W x 7.25 in H
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