Fluval Biological Aquarium Cleaner, 4 oz (120 mL) Saltwater Substrate A patented refiltration system enables

A patented refiltration system enables you to control water output while increasing dwell time within the filter

For optimal filtration

If using tap water

Does not collapse once dry

Ultra Violet Index

Fluval Biological Aquarium Cleaner, 4 oz (120 mL) Saltwater Substrate A patented refiltration system enablesFluval Biological Aquarium Cleaner helps reduce aquarium maintenance by cleaning gravel, power filters, decorations and interior surfaces. It reduces organic waste due to overfeeding, fish waste and other decaying material such as plant leaves. It is especially beneficial for goldfish, cichlid, and heavily populated aquariums. To further help ensure optimal water quality, use this product with Fluval Biological Enhancer to prevent and control