Blagdon Pond balance Blanketweed treatment is an award winning non-algicide treatment. The plant friendly formula ensures that no harm comes to any other pond plants, fish, filtration bacteria or water using wildlife. Pond balance does not effect plants because it works by making unavailable a nutrient that is only required by filamentous algae and thus literally starves it out of existence. Pond balance contains plant stimulants and so helps establish a naturally balanced pond. Small - 205g Treats 500 Gallons / 2273 Litres over 3 Doses Medium - 410g Treats 1000 Gallons / 4546 Litres over 3 Doses Large - 1.24kg Treats 3000 Gallons / 13,600 Litres over 3 Doses Large Bucket - 9.34kg Treats 56,000 Gallons / 254,576 Litres over 3 Doses