---
product_id: 472415247
title: "Airmax Knockdown Defense 2-in-1 Liquid Pond Algae Control, Effective & Fast Acting Algaecide, Aquatic Weed Treatment for Clear Water in Ponds & Lakes, Liquid Formulation for Easy Use, 16 fl oz"
brand: "airmax"
price: "6099927₫"
currency: VND
in_stock: null
reviews_count: 8
category: "Airmax"
url: https://www.desertcart.vn/products/472415247-airmax-knockdown-defense-2-in-1-liquid-pond-algae-control
store_origin: VN
region: Vietnam
---

# Fast-acting in 3-5 days Controls 7+ invasive aquatic plants Liquid formula for easy application Airmax Knockdown Defense 2-in-1 Liquid Pond Algae Control, Effective & Fast Acting Algaecide, Aquatic Weed Treatment for Clear Water in Ponds & Lakes, Liquid Formulation for Easy Use, 16 fl oz

**Brand:** airmax
**Price:** 6099927₫
**Availability:** ❌ Out of Stock

## Summary

> 🌊 Clear water, zero worries — dominate your pond’s ecosystem with KnockDown Defense!

## Quick Answers

- **What is this?** Airmax Knockdown Defense 2-in-1 Liquid Pond Algae Control, Effective & Fast Acting Algaecide, Aquatic Weed Treatment for Clear Water in Ponds & Lakes, Liquid Formulation for Easy Use, 16 fl oz by airmax
- **How much does it cost?** 6099927₫ with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/472415247-airmax-knockdown-defense-2-in-1-liquid-pond-algae-control)

## Best For

- airmax enthusiasts

## Why This Product

- Trusted airmax brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Dual-Action Power:** Simultaneously tackles floating algae and submerged aquatic weeds for total pond health.
- • **Broad-Spectrum Defense:** Effective against tough invaders like hydrilla, fanwort, and duckweed.
- • **Precision Liquid Control:** Easy-to-measure liquid formula ensures hassle-free, targeted application.
- • **Rapid Clarity Restoration:** Clears ponds & lakes in just days, beating algae and weeds fast.
- • **Optimized Dosage Efficiency:** Treats up to 5,500 sq ft with just 0.75-1.5 fl oz, maximizing value and impact.

## Overview

Airmax Knockdown Defense is a potent 2-in-1 liquid algaecide and aquatic weed treatment designed for ponds, lakes, and slow-moving waters. Its fast-acting formula eliminates a wide range of invasive aquatic plants and algae within 3-5 days. The easy-to-use liquid form allows precise dosing, making it ideal for professional and enthusiast pond management. With broad-spectrum efficacy and long-lasting results, it restores crystal-clear water and healthy aquatic environments efficiently.

## Description

desertcart.com : Airmax Knockdown Defense 2-in-1 Liquid Pond Algae Control, Effective & Fast Acting Algaecide, Aquatic Weed Treatment for Clear Water in Ponds & Lakes, Liquid Formulation for Easy Use, 16 fl oz : Patio, Lawn & Garden

Review: Aquatic weed killer and algae - This is really good stuff, but definitely do not make it too strong. It will even kill grass around. The pond if made to strong a bit pricey though
Review: Pond algae and weed killer - Works great on algae and weeds.

## Features

- Powerful formula: KnockDown Defense eliminates a variety of invasive weeds and algae including: floating algae, watermeal, duckweed, watermilfoil, fanwort, hydrilla, and more. KnockDown Defense is eﬀective in ponds, lakes, and slow moving or inactive water such as canals.
- Fast results: Whether you’re dealing with ﬂoating algae or submerged aquatic plants, KnockDown works fast to eliminate algae and weeds to restore your pond or lake in 3-5 days.
- Liquid formulation: KnockDown Defense is a liquid algae control and aquatic herbicide that is easy to measure, mix, and apply. For best results, apply aquatic weed control treatment with a surfactant and a tank sprayer.
- Innovative solution: KnockDown Defense is a fast-acting and long-lasting combination treatment for both algae and pond weed control. Developed to be effective on even the toughest invasive lake weeds and algae.
- For ponds & lakes: KnockDown Defense provides fast-acting, long-lasting pond weed control. Use 0.75-1.5 fluid ounces of KnockDown Defense for every 1/8 acre or roughly 5,500 sq/ft. Use as directed.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0B3Y5Z1S8 |
| ASIN  | B0B3Y5Z1S8 |
| Best Sellers Rank | #21,333 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #73 in Water Garden & Pond Treatment |
| Brand Name | Airmax |
| Customer Reviews | 4.1 4.1 out of 5 stars (220) |
| Date First Available  | June 13, 2022 |
| Item Form | Liquid |
| Liquid Volume | 16 Fluid Ounces |
| Manufacturer | Airmax, Inc. |
| Manufacturer  | Airmax, Inc. |
| Product Dimensions  | 5 x 2 x 9 inches; 1.43 Pounds |
| Target Species | Aquatic Plants |
| UPC | 810089840295 |
| Unit Count | 16.0 Fluid Ounces |

## Product Details

- **Brand:** Airmax
- **Item Form:** Liquid
- **Liquid Volume:** 16 Fluid Ounces
- **Manufacturer:** Airmax, Inc.
- **UPC:** 810089840295

## Images

![Airmax Knockdown Defense 2-in-1 Liquid Pond Algae Control, Effective & Fast Acting Algaecide, Aquatic Weed Treatment for Clear Water in Ponds & Lakes, Liquid Formulation for Easy Use, 16 fl oz - Image 1](https://m.media-amazon.com/images/I/51OUdezWiuL.jpg)
![Airmax Knockdown Defense 2-in-1 Liquid Pond Algae Control, Effective & Fast Acting Algaecide, Aquatic Weed Treatment for Clear Water in Ponds & Lakes, Liquid Formulation for Easy Use, 16 fl oz - Image 2](https://m.media-amazon.com/images/I/71eiodQk1+L.jpg)
![Airmax Knockdown Defense 2-in-1 Liquid Pond Algae Control, Effective & Fast Acting Algaecide, Aquatic Weed Treatment for Clear Water in Ponds & Lakes, Liquid Formulation for Easy Use, 16 fl oz - Image 3](https://m.media-amazon.com/images/I/71lwkq+iKWL.jpg)
![Airmax Knockdown Defense 2-in-1 Liquid Pond Algae Control, Effective & Fast Acting Algaecide, Aquatic Weed Treatment for Clear Water in Ponds & Lakes, Liquid Formulation for Easy Use, 16 fl oz - Image 4](https://m.media-amazon.com/images/I/71SkDLtD8rL.jpg)
![Airmax Knockdown Defense 2-in-1 Liquid Pond Algae Control, Effective & Fast Acting Algaecide, Aquatic Weed Treatment for Clear Water in Ponds & Lakes, Liquid Formulation for Easy Use, 16 fl oz - Image 5](https://m.media-amazon.com/images/I/61eeIG+ZPhL.jpg)

## Available Options

This product comes in different **Color, Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Aquatic weed killer and algae
*by G***T on February 23, 2026*

This is really good stuff, but definitely do not make it too strong. It will even kill grass around. The pond if made to strong a bit pricey though

### ⭐⭐⭐⭐⭐ Pond algae and weed killer
*by K***C on March 13, 2026*

Works great on algae and weeds.

### ⭐⭐⭐⭐ IT WORKS!
*by T***E on May 19, 2024*

I am not an expert on plants or weeds that invade ponds. I am an expert on knowing products that work! This product works! My pond was literally taken over by one invader that was not welcome! My pond is about an acre and is stocked with fish so I had to be careful. The weeds started dying in two days and there were no floating fish! BINGO!! The application is easy you simply walk around your pond and throw granules in your water!

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-03-24*