Blue Planet Aquarium Algae Control Block is an Australian made aquarium product. Effectively controls most algae common to freshwater aquariums. Kills growing algae and prevents algae from recurring.
How to use: To control algae, and one piece per 20L of water or one complete block per 120L of aquarium water. This block is best used as a preventative or when algae first appears or after cleaning an algae infested tank. The block will dissolve over 7-14 days depending upon water conditions and rate of flow from filter. If possible, control the amount of sunlight or artificial light to reduce the growth of algae. Repeat only when algae reappear. Do not overdose.
Follow directions on label.