PondMax String Algae Treatment Keep your pond clear of string algae with our PondMax String Algae Treatment. Check out our range of Pondmax pond accessories for more pond treatments to keep your pond looking healthy. Before starting the treatment program and during treatment, it is advisable to remove as much filamentous algae as possible. This will help to preserve oxygen levels and provide a longer-lasting effect. To Calculate Pond capacity: Length x Width x Average Depth. (Measurements in Metres x 1000 for Litres Specifications and Features Naturally clears blanket weed (String Algae). Contains natural plant extracts. Clears naturally. Fast acting. Safe for pets, fish and plants. Treats up to 5000L. Instructions Remove as much string algae as possible. Half fill a bucket with warm water and mix in the treatment evenly throughout the pond. Add 10g (1 scoop) of treatment per 1000L of pond water every week for one month, and then add 1 scoop once a fortnight to maintain pond efficiency.