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 & aquascaping 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 Dosage: 1 drop per 100 litres (27 US gal.) daily Shake well before use. ONCE OPENED STORE IN FRIDGE Store in a cool dry place away from light Capacity: bottle of 50ml (1.7 fl.oz.)