Provide a large, multifaceted surface area for the growth of beneficial ammonia-neitralizing bacteria responsible for biological filtration. Contains 140 ceramic rings.
- Bio-Rings do not require replacement unless damaged or destroyed
- In the event of excessive buildup, you may genlty rinse with water from an established aquarium, if desired
- Do not clean with soaps or abrasives and never rinse with tap water
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