Bio Clear Special Blend feed cl0 waterfall lights these 11 watt 4400HAF400 these 11 watt Bio Buster™ Other Brands 10 Billion + colonies of beneficial bacteria per gram 500 million to 1 billion colonies of bacteria per gram Apply only once per month Apply every week or every two weeks Fewer application & lower cost More application & higher cost Apply to water temperature as low as 38 degrees Apply to water temperature above 55 degrees Results of 12 + inches of muck reduction per season Reduces 5 inches of muck or less per year No blending or mixing Might require mixing & blending One 32 oz bottle treats up to 80 Bio Clear™ Special Blend removes nitrogen and temporarily binds phosphorus in the water column reducing algae blooms