Algae Defense

Aquatic Algaecide

Fast-Acting Liquid Formula
Eliminates Floating & Suspended Algae
Treats Up To 8,000 sq. ft.

Cannot be shipped to AK, CA, CT, DC, HI, ME, NJ, NY, PR, RI, VT, WA

Please select an option.

  • 1 Gallon
  • Item: 530130
  • $62.49


Algae Defense has been created to provide rapid results and can be applied directly to problematic algae and chara. Effectively treating floating and bottom-growing algae without water use restrictions, making it ideal for freshwater lakes, drinking water reservoirs, and game fish ponds. Water treated with Algae Defense can be utilized instantly for recreational purposes, drinking, and irrigation.

Reactive treatments such as algaecides, herbicides, and mechanical tools can help control unwanted weeds or algae and are a key step in the Airmax Ecosystem, a simple 3 step approach to pond and lake management. The Airmax Ecosystem is the industry-leading method to achieve a clean, clear, thriving aquatic ecosystem. Learn more about the Airmax Ecosystem.



Video - Algae Defense
Video - Airmax Ecosystem
Algae Control
Airmax Ecosystem
Product Label - 1 Gallon

Weeds Treated

String Algae


How to Use

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


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

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


Algae Defense should be applied to target algae while it is active and growing. The active ingredients in Algae Defense will be absorbed by the plant, killing it entirely.


Mix the desired amount of Algae Defense and pond water in accordance to label directions. Using a pressurized sprayer, spray the Algae Defense mixture directly onto the target algae. Use with Treatment Booster Plus for best results. Over time, treated algae will begin to brown and die. Once it is completely dead, rake the dead algae away to prevent plant decay and pond muck accumulation.


Algae Defense is not recommended to be used in ponds with koi, goldfish, grass carp, or trout, unless carbonate hardness is above 50ppm.


Algae Defense can not be shipped to Alaska, California, Connecticut, District of Columbia, Hawaii, Maine, New Jersey, New York, Puerto Rico, Rhode Island, Vermont, Washington or Canada.


Accessories & Related Items




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Airmax is committed to product quality and your satisfaction. If you have any questions regarding the use of our products please don't hesitate to contact us. We would be happy to hear from you.


Item Numbers and UPC

Item Number
UPC Code
530130 895394000398 1 Gallon

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