The 4 pack of 20 gram Aqua Pond Algae Eliminator Blocks effectively controls many algae problems common to ornamental fish ponds. The Pond One Algae Eliminator Blocks kill growing algae and prevents algae from recurring. Suitable for cold water and tropical environments.

About This Algae Block

• 4 20g blocks
• Slowly dissolves over 7-14 days
• Add one piece per 200L or one whole block per 800L

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