Scale Out is used to combat scale formation on the pool surfaces, the circulation system, piping and heating system caused by high calcium levels in pool water. Regular use will keep the pool surface and plumbing clean. Dosage and Directions for use: Use an initial treatment of 200ml per 10 000L of water. Add directly to the pool water with the pump operating for a minimum of 8-10hrs. Use a monthly maintenance dose of 100ml per 10 000L of pool water.