Using Ocare can reduce the amount of bromine or chlorine you use in your swim spa by up to 78%. Chemicals can irritate eyes, ears and skin so it is great for children. SOFT: The mixture of high quality mineral salts will leave your skin feeling soft and odourless. You will not need to shower after bathing, which is important when using chemical treatments alone. SIMPLE: Just add the 2 compounds to the spa water once a week with the measuring cup included. This pack will last 3 to 5 months depending on the size of your swim spa. This pack is specifically designed for Swim Spas as it has 2 x 5L bottles, perfect for larger sized hot tubs with high literate capacities. Comes with measuring cup and instructions. DOSE EXAMPLES: For a 4500 Litre Swim Spa, use a 200ml dose, which means this pack will last you 25 weeks. For an 8500 litre swim spa, use a 500ml dose of each solution each week, this pack will last you 10 weeks.