Liquid Polymer - Media for a growth of probiotic bacteria. When -NP Pro is added to the water, bacteria will grow rapidly. These bacteria will convert unwanted nutrients, like nitrate and phosphate into biomass. As a result valuable bacterioplankton is absorbed by corals (providing an additional source of natural food). Recommended to use in conjunction with Pro Bio S. Dosage: 1 drop per 100 litres (27 US gal) daily.