Systems and tanks must be completely free from deposits, therefore when needed, clean system with DESCALING LIQUID before applying ECOSPERSE. SEA WATER COOLING SYSTEMS: Dose once weekly for an hour , according to the flow rate of sea water in each particular system. DeepSea vessels dose metered in the suction box or strainer at the rate of 0.3 liters / 100 tons of sea water over a period of one hour every 48 hours. Coastal vessel dose metered in the suction box or strainer at the rate of 0.3 liters every 100 tons of sea water flow over a period of 24 hours. When vessel at anchor or in prolific zones of shellfish, the period or frequency of treatment should be increased.