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Blast It is a powerful weed and grass killer used to prevent Nutgrass from penetrating the vinyl liners of above-ground pools. For application use seven pounds (7 lbs) per 1,000 square feet. As soon as final grading is complete mix Blast It into the top two-inch of the soil then spray with a fine mist of water. Once the pool installation is complete clear an 18-inch perimeter around the pool and treat that area as well. The perimeter should be treated annually.
