The AQUASTOP conditioner is designed to create and maintain a safe, healthy environment in a freshwater aquarium by suppressing the growth of blue-green algae. Its action is based on lowering the pH of the water in the aquarium, i.e. on the creation of conditions unfavorable for the existence of these algae. At the recommended concentration, AQUASTOP is safe for fish. However, even with its gradual introduction into the aquarium, the pH value changes relatively sharply, which often causes painful conditions in the inhabitants of the aquarium. To prevent this side effect at the time of processing the aquarium its inhabitants can be moved to another aquarium.