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These Quartz rings from Aquatop are perfect for added biological filtration
in either salt or freshwater. They are made of heated and compressed quartz
that provides a large amount of surface area for the beneficial bacteria to
live and grow. The quartz used is inert.
14 oz. Comes with a free mesh bag!
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Visit Manufacturer's website: www.aquatop.com
Aquatop Quartz Rings 14oz