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BioGuard Back Up® 2 is the preferred algae preventative for the BioGuard Care System. Weekly use of this product prevents algae before it starts. Back Up 2 is formulated to complement swimming pool sanitizers. It is a highly effective algae killer and algae preventative. The wetting agent in this product allows it to penetrate small crevices where algae are likely to form. This product provides a resideual effectiveness that protects your pool against algae formation while keeping your pool sparlking clear. It protects the unattended pool from algae when you're away.

  • Highly effective, broad spectrum algae preventative
  • Keeps pool water clear & free of visible algae
  • Activity increases as water temperature rises  (when you need protection the most!)
  • Will not affect pH levels
  • Non-staining
  • Suitable for all pool surfaces
  • Use once a week
Product Info

Available sizes: 1 quart

  • 40% quaternary ammonium based algicide
  • pH  =  approx. 7.5
How To Use

Apply product with the pump running.

For maintenance:

For initial application, add 6 oz per 10,000 gallons directly into the pool. Then apply 1.5 oz. per 10,000 gallons every 5-7 days for maintenance.

Booster application:

Add q.5 oz of Back Up 2 per 10,000 gallons of pool water when bather load is heavy or after prolonged rainfall.

For algae treatment:

For visible algae, add 3 lb. of BurnOut 73 per 16,500 gallons or 3 lb. of Smart Shock per 12,000 gallons. Follow application instructions for these products. Then add 13.5 oz of Back Up 2 per 10,000 gallons in areas of heaviest algae growth. Circulate continuously for the next 24 hours. Then brush the pool thoroughly. Do not re-enter the pool until the chlorine residual returns to 1 - 4 ppm. In cases of persistant algae, repeat brushing and product application after 2 - 4 days.

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