Independent Store Brand Pond and Aquarium Clear Blocks will clear Green Water and Bacterial Algae in Approximately 7 Days and depending on water hardness will last 3 to 4 weeks.
The Majority of aquarium algae are actually bacteria, as a result this product is not herbicidal but anti-bacterial.
This block also assists in the prevention of Ammonia Spikes and will stabilize Aquarium PH by resisting with acidifying PH Reduction
Treats: 1000-3500 ltrs