Product Fact Sheet: BioGuard Back-Up II Algae Inhibitor

Product Features:

  • Unique non-staining formulation.
  • More effective against a wider variety of algae than many algae preventatives.
  • Withstands up to 50 ppm of chlorine.
  • Built-in water clarifiers.
  • Contains metal chelating agents.


  • Effective against all common and many mutant strains of algae.
  • Long-lasting protection – lasts up to 3 months.
  • Faster removal of dead algae.
  • Clearer pool water.

Application Instructions:

  1. Vacuum leaves and other foreign matter from pool.
  2. Backwash filter.
  3. For treating visible algae, use MSA II as per label directions.
  4. Metals from source water, ionisers or poorly sequestered copper-based algaecides have the potential to stain pool surfaces. Treat these problems using Pool Magnet and Quick Clear at least 5 days before using Back-Up II.
  5. Pour 50 mL of Back-Up II per 10,000 litres into a bucket containing at least 4 litres of clean water. Stir to completely dissolve all material.
  6. With pump running, pour the diluted Back-Up II around the edges of the pool near areas of greatest circulation.
  7.  Allow the water to circulate for at least 2 – 4 hours after application.
  8. Apply a maintenance dose of 10 mL per 10,000 litres weekly, or 40 mL per 10,000 litres every month.

Available Sizes:

  • 1-litre bottles
  • 20-litre jerry
  • 5-litre jerries

NOTE: Avoid physical contact with product. Do not store near petroleum products. Follow safety information on label Instructions. Store in a cool, dry place. Keep out of the reach of children.