Nishikoi Goodbye Blanketweed treatment for 1000 gal pond treatment each week for 6 weeks! The product is excellent quality and is very successful in the control of unwanted Blanket Weed.Nishikoi Goodbye Blanket Weed contains a unique, worldwide patented bio-product consisting of bacteria cultured on barley straw, enzymes and activated barley straw.Now in an Eco Pack - over 50% less packaging.