Barley straw is the all-natural way to keep your pond fresh and clear all summer long. And for large ponds, the most convenient and economical way to dispense barley is with our Barley Strip. It's easy to use, and just one strip cleans ponds up to 10,000 gallons. Encourages clearer ponds Safe for fish, pets and plants Strip is 33' x 7" x 1/2" thick Treats ponds 7,000 to 10,000 gallons For best results, place in pond early in the season For ponds that are from 700 to 2,224 gallons, use our Barley Ball. For water gardens and small ponds that are from 10 to 700 gallons, use Barley Pads Pond SizeWe recommend: 10-700 gallons1 Barley Pad 700-2,244 gallons1 Barley Ball 2,245-4,488 gallons2 Barley Balls 4,489-6,732 gallons3 Barley Balls 7,000-10,000 gallons1 Barley Strip To calculate gallons: Length (in feet) x width x average depth x 7.5 = gallons Gardener's Supply Exclusive