Polar Blend is a highly concentrated blend of cold-loving beneficial bacteria and fast acting enzymes. Recommended for water temperatures 18°C and below, down to 4°C. Polar Blend is a dry formula packaged in ½ pound water-soluble packets that contain 23 essential vitamins, catalyzing enzymes and select bacterial species at exponential activity levels. Polar Blend infuses bacterial cells with the vitamins, minerals, and amino acids essential to healthy and robust cell development. Polar Blend is one of our most potent blends, and it excels at degrading dead organic matter in colder water temperatures. Initial dosage is 3 lbs per surface acre and maintenance dosage is 1 lbs per surface acre.