Airmax KnockDown Defense is a fast-acting, EPA-registered liquid herbicide designed to control invasive submerged weeds and nuisance algae. With 42% of the active ingredient Flumioxazin, KnockDown effectively targets duckweed, watermeal, fanwort, hydrilla, and many other aquatic weeds.
This versatile formula works in ponds, lakes, canals, bayous, reservoirs, drainage ditches, and marshes. KnockDown breaks down quickly in water, won’t accumulate in sediment, and won’t clog application sprayers.
For best results, mix KnockDown Defense with Treatment Booster Plus in a tank sprayer for enhanced coverage and absorption.
State Restrictions
Airmax Shoreline Defense cannot be shipped to AK, CA, CT, DC, HI, MA, ME, NJ, NY, PR, RI, VT, WA, or Canada
KnockDown Defense has no temperature restrictions. Apply when weeds and algae are actively growing. In areas with dense vegetation, only treat ½ of the waterbody at a time, then wait 10–14 days before treating the remaining section. Do not re-treat the same area within 28 days of application.
How to Apply
Dilute KnockDown Defense with clean tap water according to label directions.
For best results, mix KnockDown Defense with Treatment Booster Plus to improve coverage and absorption.
Water Use Restrictions
State Restrictions
Airmax KnockDown Defense cannot be shipped to: Alaska, California, Connecticut, Delaware, the District of Columbia, Hawaii, Massachusetts, Maine, New Jersey, New York, Puerto Rico, Rhode Island, Vermont, Washington, or Canada.
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| Size | 16 Ounce |
| Application | Liquid |
| Temperature Restriction | None |
| Square Footage Per Container | Up to 1 Acre (43,560 sq ft) |
| Shelf Life | 2 Year |
Dosage Rates
Example: For a 1/8 acre pond with an average depth of 3 ft, use 12 fl oz of KnockDown (4 fl oz × 3).
| Treatment Area | KnockDown Defense Surface Application | KnockDown Defense Subsurface Application 3' Avg. Depth | Water (Gallons) | Treatment Booster Plus |
| 1/8 Acre (5,445 sq ft) | 0.75 - 1.5 fl oz | 6.6 - 13.2 fl oz | 1 gallon | 2 fl oz |
| 1/4 Acre (10,890 sq ft) | 1.5 - fl oz | 13.2 - 26.4 fl oz | 2 gallons | 4 fl oz |
| 1/2 Acre (21,780 sq ft) | 3 - 6 fl oz | 26.4 - 52.8 fl oz | 4 gallons | 8 fl oz |
| 1 Acre (43,560 sq ft) | 6 - 12 fl oz | 52.8 - 105.6 fl oz | 8 gallons | 16 fl oz |
Please Note: The above are general recommendations. Always read and follow the product label instructions. Apply at the proper rates to help prevent plants from developing chemical resistance. For best results, treatments are most effective when applied in the early morning.
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