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- Perfect for use in freshwater, saltwater wet/dry filter systems and pond filters
- Promotes gas exchanges that removes harmful gages and wastes
- Provides large surface area that promotes the growth of beneficial bacteria in bio-logical filtration
- 200 pieces per pack, 2.5 gallon
- Size: 1.5" Diameter
- Treats: 50 gallons for saltwater / 100 gallons for freshwater
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