Airmax KnockDown Defense 2-in-1 Algae & Aquatic Weed Control rapidly clears nuisance vegetation from your pond. This broad-spectrum algaecide plus herbicide formula provides long-lasting control of floating algae and aquatic weeds. Perfect for combatting invasive and hard-to-treat plants like watermilfoil and hydrilla. Combine with Airmax Treatment Booster Plus to penetrate cell walls for faster results. Rake out dead vegetation to protect against oxygen drops and increase effectiveness. One 16-ounce bottle of KnockDown Defense treats ponds up to one surface acre. Please wait 28 days between repeat applications, and do not treat more than half of the waterbody at a time. 

- 2-in-1 Treatment Controls Algae and Weeds
- Effective in Still or Slow-Moving Water
- Easy-to-Apply Liquid Formula Provides Faster Results
- Safe for Long-Term Use; Does Not Accumulate in Sediment