Large Bio-Balls: One Bio-Pin ball has 150 Bio-Pins (drip points). There are 74 balls per gallon. One cu.ft. of media has appoximately 130 sq. ft. of surface area. The suggested usage is one gallon of Bio-Pin Balls per 20 gallons for salt water and one gal. per 35 gallons of freshwater. Outside Diameter 1.60"
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