This stain treatment solution for pools prevents metal staining and helps clear discolored water caused by high metals, especially in salt pools. Ideal for pools with salt systems. Decreases cell smell in chlorine generators. Effectively prevents metals from staining surfaces. Phosphate-free formula. For start-up, use 1 quart per 10000-gallon of pool water. Dilute in a pail of water and add to the deep end with the circulation system on. For freshly stained pools or discoloration of water from metals, add 2 quart per 10000-gallon. Maintenance application, Use 6 to 8-ounce per 10000-gallon of pool water, added to the deep end weekly.