Tornado Algae Block
- Suitable for ponds with fish or aquatic plants
- Treats 800L per block or can be broken on to 4 parts which treat 200L each
- Blocks dissolve over 1-2 weeks depending on conditions and circulation
- Do not use in ponds without a pond pump running
- Repeat if algae re-appears
- Do not overdose or use another block until previous block has fully dissolved