BIOSPHERE BALL = OXIDIZER CAREFREE ENZYMES: BIOSPHERE BALL = OXIDIZER $10.25 SKU: CFE93009 QTY: Click here to save 5% off of your order! BIOSPHERE BALL - OXIDIZER Keep your pond water clear and properly oxidized using the CareFree Oxidizer Biosphere. This small plastic ball contains water enhancing enzymes which prevent pond buildup from forming on waterfalls and rocks. Simply place this sphere inside your skimmer or next to your pump if you do not have a skimmer.  The compounds in the biosphere will leach out over 20 to 30 days, breaking down any organic debris within the water and maintaining a fresh looking water feature. The CareFree Oxidizer Biosphere treats 100 to 500 gallons of water and is safe for plant and animal life. Dimensions: 2.5 dia.