Birm 1 cu. ft.

Granular / Gray / Must not be used on waters with a pH < 6.8 / Must have dissolved oxygen present at a level of at least 15% of iron & manganese ppm / Max iron &manganese level 10 ppm / Estimated life about 8-10 years\ Handles: Sediment               Iron (clear & red)               Manganese (clear & red)   FREE SHIPPING IN UNITED STATES         FOR CALIFORNIA RESIDENTS CALIFORNIA PROPOSITION 65 WARNING: This product contains chemicals known to the State of California to cause cancer, and birth defects or other reproductive harm. www.P65Warnings.ca.gov