Use BIOGUARD BACK UP 2 To Prevent Algae In All Pool Types. Back Up 2 Is The Preferred Algae Preventative Of The BioGuard 1-2-3 Pool Care System.
Label Directions For Use: Read entire product label and use strictly in accordance with precautionary statements and directions.
Ensure all pool equipment is working properly. Clean or backwash the filter following manufacturer's directions.
Adjust stabilizer levels to 30-50 ppm by adding stabilizer.
Check water alkalinity, pH and calcium hardness with a test kit or test strip. Adjust alkalinity to 80-125 ppm for plaster pools, 125-150 ppm for vinyl or fiberglass pools by adding an alkalinity increaser. Adjust pH to 7.2-7.6 by adding a pH decreaser to lower pH, or by adding a pH increaser to raise pH. Adjust calcium hardness to 200-275 ppm for plaster pools, 175-225 ppm for vinyl or fiberglass pools by adding a calcium hardness increaser.
Check and adjust residual chlorine level to desirable range of 1-4 ppm.
This product is effective in controlling the growth of both green algae and blue-green (or black) algae. Add this product directly to pool by pouring around entire outside perimeter of pool while filter and pump are in operation. To provide time for even distribution in the pool water, wait at least 15 minutes after application before entering pool.
Label Directions For Pools With Visible Algae: If algae are visible, use 13.5 fl oz of this product per 10,000 gallons of pool water. After 24 hours clean out dead, settled algae. If algae is still present, repeat dosage as necessary.
Label Directions For Pools With No Visible Algae:
Initial Application: Add 6 fl oz of this product per 10,000 gallons of pool water.
Maintenance Application: Add 1.5 fl oz of this product per 10,000 gallons of pool water every 5-7 days.
Booster Application: Add 1.5 fl oz of this product per 10,000 gallons of pool water when bather load is heavy or after prolonged rainfall.
To Close Pool: Add 10.5 fl oz per 10,000 gallons along pool edges and allow filter and pump to operate for 2-4 hours. This will provide 4 ppm active ingredient in the water. This will help control algae growth over the winter months and make for easier clean-up in the spring. Visit www.bioguard.com or consult your BioGuard dealer for complete pool closing instructions.