BioGuard Back-Up 2


SKU: 23050BIO Category: Tag:

Product Description

BioGuard Back Up 2 Algaecide is BioGuard’s most effective algae preventative. The highly effective formula prevents wide variety of algae growth. It’s stable in sunlight and will not evaporate. The activity of this product increases as water temperature rises, which is when you need protection the most. Back Up has a powerful surfactant/wetting agent, which makes it able to work in the tiny cracks and crevices where algae starts. This product will not affect pH levels and is non-staining.

Product Dosage

Routine Maintenance:

1 fl oz per 5,000 gallons of water per week, or 2 fl oz per 5,0000 gallons of water every 2 weeks.

Initial Application:

32 fl oz per 25,000 gallons of water.

Vacation Application:

4 fl oz per 5,000 gallons of water for every week unattended.


Pre-Treatment Checklist:

  1. Ensure all pool equipment is working properly.
  2. Adjust the pH to between 7.2-7.6.
  3. Adjust chlorine residual to 1-3 ppm. In a chlorinated pool.
  4. Add stabilizer to establish a minimum stabilizer level of 30-40 ppm to reduce the damaging effects of sunlight upon the chlorine residual
  5. Check for metals and if present, add a stain and scale inhibitor to prevent staining of pool surface due to metals.
  6. Check chlorine residual and adjust to 1-3 ppm. When using other products as outlined in directions for this product.

Wait at least 15 minutes after application before entering pool.

Initial Application or When Pool Water is Changed:

Pour 32 oz. directly into pool per 25,000 gallons of water.

Routine Maintenance:

For weekly application intervals, use 1 oz. per 5,000 gallons of water. For two week application intervals, use 2 oz. per 5,000 gallons of water every other week.

Following heavy rain showers, add an additional 1 oz. per 5,000 gallons.

Vacation Treatment:

Add 4 oz. of this product per 5,000 gallons for every week unattended. Pour product around the edges of the shallow end of the pool if shock is also being applied in the deep end of the pool.


Alkyl[50% C14, 40% C12, 10% C16] Dimethyl Benzyl Ammonium Chloride: 50%, Other Ingredients: 60%


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