Bermuda Barley Straw pouch twin pack, is a natural & effective way to help control the growth of algae in your pond. The straw
...The Bermuda Barley Straw Bumper Bale will help prevent the growth of algae & blanketweed in small ponds. Simply add the straw bale to your pond. Once the straw starts to decompose it will begin to release an enzyme which will help prevent the growth of algae. You will need to allow up to 4 weeks for the enzyme to be released. Treats up to 9, 000 litres / 2, 000 gallons for up to 6 months.