Salt Shift Marine Engine Flush is an advanced, eco-friendly flushing formula that removes salt and sediment build up from your engine cooling system. Blended with corrosion inhibitors it protects your outboard motor or PWC engine making it run healthier for longer. Features: Remove salt & calcium in 30s Descales cooling system Corrosion barrier Safe gaskets & rubbers Plant-derived formula* Biodegradable | Hazard-free PH neutral | Phosphate free Australian made How to Use: Step 1: Fill the Salt Shift Flusher Canister with 50ml of Salt Shift Engine Flush. Step 2: Plug the flusher canister into your garden hose, and then into your cooling system flush connection. Step 3: Turn the flush canister dial to setting 3/the larger circle being 3. Step 4: Flush your engine as per your manufactures owners manual.