Goodbye Blanket Weed isa unique, worldwide patented bio-product consisting of bacteria cultured on barley straw, enzymes and activated barley straw. Easy-to-use, no mess, no measuring. Simply drop one water-soluble sachet of \'Nishikoi Goodbye Blanket Weed\' into the pond or filter every week. One water-soluble sachet treats ponds up to 1000 gallons. Each pack of \'Nishikoi Goodbye Blanket Weed\' is an 6 week treatment for a 1000 gallon pond. Effective against blanketweed, green water and organic sludge.