Biotec Algae Block 21g, 1 block

Algae Blocks by Biotec are a slow-release algae killer. Controls hairy algae and green water over 5 to 10 days by disrupting algae photosynthesis. Clears tanks & ponds. Stabilizes tank & pond water. Directions for use. Place the block in the tank or pond or crush the block to smaller granules & sprinkle them onto hairy algae directly.

Algae Blocks Information;

• Clears tanks & ponds
• 1g treats 57 litres
• 3.5g treats 200L
• 21g treats 4200L
• APVMA Australia approved