Algae Defense - Gallon

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Product Details

  • Quickly Eliminate Algae & Chara
  • Fast Acting Liquid Formula
  • Spray Directly Onto Algae Blooms

Eliminate algae blooms and green water from your pond with Airmax Algae Defense. A fast-acting, liquid, pond algaecide formula, Algae Defense can be directly applied via a pressurized sprayer to combat floating filamentous algae, chara or the planktonic algae that causes green water. Each gallon of Algae Defense pond algaecide treats up to 8,000 square feet and can be used when water temperatures are at or above 60°F.

Airmax Algae Defense

How to Use

Application Liquid
Temperature Restriction Use When Above 60°F
Square Footage Per Gallon Up to 8,000 Square Feet
Shelf Life 2 Years

Dosage Rates

Treatment Area
Algae Defense
Treatment Booster Plus
1,000 Square Feet 1/2 Quart (16 Ounces) 1-1/4 Gallons 4 Ounces
2,000 Square Feet 1 Quart (32 Ounces) 2-1/2 Gallons 6 Ounces
4,000 Square Feet 2 Quarts (64 Ounces) 5 Gallons 12 Ounces
8,000 Square Feet 4 Quarts (1 Gallon) 10 Gallons 22 Ounces


Please note: Above are recommendations. Always read the product label.

How to Apply

Mix the amount of Algae Defense and Treatment Booster Plus (if using) with pond water in a tank sprayer according to label instructions. Use a pressurized pond sprayer to spray the Algae Defense mixture directly onto the target algae.

When to Apply

Algae Defense should be applied when algae is actively growing. Begin applications when algae first appears. Unless steps are taken to reduce the overall nutrients in the pond, multiple applications may be needed for full season algae control. Use with Treatment Booster Plus for best results.


  • Do not use in ponds with trout, unless carbonate hardness is above 50ppm.
  • Do not use in ponds with koi, grass carp or goldfish.
  • Not for use in water garden or koi ponds.

Chemical Application Best Practices

Anytime you use chemicals to treat algae or weeds, please keep in mind the following:

  • Treat your pond in sections. Treat only half the pond's surface at a time. During hot weather or when treating heavy growth, it is important to treat no more than 1/4 of your pond at a time and wait the full 14 days before re-applying. This helps lower the risk of fish loss during hot weather or when treating heavy growth.
  • Once the algae or weeds have browned & died, use a rake to remove as much dead material as possible. This prevents an accumulation of dead plant material and muck.
  • Take a proactive approach to pond management. Use PondClear, MuckAway and Pond Dye to keep your pond looking great.