$12 · Barley Straw for large fish pond

It was a 2 pack. I opened it and took one apart to make it into smaller packs to use in a small pond. I decided it's not really what I want so it's back in the package and taped closed. It's new still, none have been wet or used. It's made by Summit chemicals. Price is $12. Package says good for up to 2000 gallons.