1x 20g Block

A slow release block for the control of algae within freshwater aquariums.

DIRECTIONS:
To control algae, add one piece per 20 litres or one complete block per 120 litres of water.
This block is best used as a preventative or when algae first appears or after cleaning an algae infested aquarium.

Blocks will dissolve over 7-14 days depending on water conditions and circulation.
If possible, control the amount of sunlight or artificial light to reduce the growth rate of algae.

Repeat only when algae reappears.
To prevent oxygen depletion, remove heavy algae growth mechanically before treatment and aerate the water after use.