If you have green water this is a great short-term solution as it will kill of the algae that cause the problem. The dead algae will sink to the bottom of the pond so it should be used in conjunction with Sludge Buster.
Available in two sizes: 250ml - treats 11365 litres 1000ml - treats 45460 litres
Bradshaws Direct (UK) - suppliers of pond liners (pvc and butyl liners), underlay, pond pumps, filters, pond vacuums, fish food, water features and many other water garden accessories.