EC6 Protect is is a highly effective slow release, long life a coolant protectant. Simply add to de-ionised water, purified water, or coolant for years of protection against substances. Slow Release and Long Life Non-corrosive Low Odour Non-Foaming Low viscosity Mix with water at a ratio of 6ml per litre. One bottle will treat 5 litres of water. Do not mix in a higher than recommended ratio. EC6 Coolants already contain EC6 Protect.