Recommended for the repair of minor leaks and cracks in spas. Usually stops leaks in 24 hours. 1. Turn pump off. REMOVE cartridge or filter grids to avoid product from passing through the filtration system. 2. If the leak location is unknown, add the recommended dosage to the skimmer. If you are sure of the location of the leak, pour the recommended dosage directly into the water at the area of the leak. 3. After 30 minutes following application, turn pump on and allow to run for at least 8 hours. 4. Check spa to see if it is still losing water. A second application may be necessary and can be made within the next 24 hours. 5. Replace filter grids or cartridges after 24 hours and resume normal filtration. Spa may be entered 24 hours after application. 1 ounce per 500 gallons of water.