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 25g water-soluble sachet treats ponds up to 8000 gallons.Each pack of \'Nishikoi Goodbye Blanket Weed\' is an 8 week treatment for a 8000 gallon pond.Effective against blanketweed, green water and organic sludge.