The Durachlor Blast It product is powerful preventative granular that will effectively keep vinyl liners from being ruined by nutgrass or nutsedge. Nutgrass, or also know as nutsedge, can destroy vinyl liners by growing through the liner. This product will sterilize nutgrass seeds before they are able to germinate. Blast It will not crack, discolor, or soften liners. Use this product to ensure a long lifetime for your vinyl liners.