Highly concentrated probiotic bacteria. Supplement contains several specially selected bacteria strains. Key function is to transform phosphate and nitrates to a biomass which can be easily removed by the skimmer or consumed by corals, sponges, clams and other organisms. Bacteria will significantly reduce organic sediment accumulating in the substrate & elements. To achieve better results it’s recommended to place in the sump an additional bacteria medium like Siporax or sand. ProBioS protects your tank against pathogenic organisms. Recommended to use in conjunction with ProF or ProBioF.