The Serenity Green Water Destroyer Block for Aquariums effectively controls most algae common to freshwater aquariums and ornamental fish ponds. The product kills growing algae and prevents algae from recurring. The flocculent in the block will then bind any floating dead algae or suspended particles causing them to sink to the bottom, where they can be siphoned of with ease or broken down by naturally occurring bacteria.
It is best used when green patches appear in the aquarium. You can also use the block as a preventative. The block will dissolve over 7-14 days depending on water condition and rate of flow from the filter. Repeat process if green patches or green water appear in the future.