--- product_id: 472415247 title: "Airmax Knockdown Defense 2-in-1 Pond Algae & Weed Control, 16 fl oz | Fast-acting algaecide and aquatic weed treatment helps clear ponds and lakes with an easy-to-use liquid formula" brand: "pond logic" price: "S$196" currency: SGD in_stock: true category: "Pond Logic" url: https://www.desertcart.sg/products/472415247-airmax-knockdown-defense-2-in-1-pond-algae-and-weed store_origin: SG region: Singapore --- # Fast 3-5 day action Targets 7+ invasive species Easy liquid formula Airmax Knockdown Defense 2-in-1 Pond Algae & Weed Control, 16 fl oz | Fast-acting algaecide and aquatic weed treatment helps clear ponds and lakes with an easy-to-use liquid formula **Brand:** pond logic **Price:** S$196 **Availability:** ✅ In Stock ## Summary > 🌊 KnockDown Defense: Because your pond deserves a glow-up! ## Quick Answers - **What is this?** Airmax Knockdown Defense 2-in-1 Pond Algae & Weed Control, 16 fl oz | Fast-acting algaecide and aquatic weed treatment helps clear ponds and lakes with an easy-to-use liquid formula by pond logic - **How much does it cost?** S$196 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/472415247-airmax-knockdown-defense-2-in-1-pond-algae-and-weed) ## Best For - pond logic enthusiasts ## Why This Product - Trusted pond logic brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Dual-Action Power:** Combines algaecide and herbicide to tackle algae and weeds simultaneously. - • **Rapid Restoration:** Clears ponds & lakes in just 3-5 days—no more waiting around! - • **Long-Lasting Impact:** Keeps your aquatic environment clear and healthy for weeks. - • **Precision Application:** Liquid formula ensures easy measuring, mixing, and targeted treatment. - • **Broad Spectrum Control:** Effective against floating algae, watermeal, duckweed, hydrilla, and more. ## Overview Airmax Knockdown Defense is a fast-acting, 2-in-1 liquid treatment designed to eliminate a wide range of invasive aquatic weeds and algae in ponds, lakes, and slow-moving waters. With measurable dosing and visible results in 3-5 days, it offers professional-grade pond care that’s easy to apply and long-lasting. ## Description desertcart.com : Airmax Knockdown Defense 2-in-1 Pond Algae & Weed Control, 16 fl oz | Fast-acting algaecide and aquatic weed treatment helps clear ponds and lakes with an easy-to-use liquid formula : Patio, Lawn & Garden ## 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 | #17,443 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #69 in Water Garden & Pond Treatment | | Brand Name | Pond Logic | | Customer Reviews | 4.6 4.6 out of 5 stars (68) | | Date First Available | June 13, 2022 | | Item Form | Liquid | | Item Weight | 0.65 kg | | Liquid Volume | 16 fluid ounces | | Manufacturer | Airmax, Inc. | | Manufacturer | Airmax, Inc. | | Manufacturer Part Number | 530268 | | Pet Type | Amphibian, Fish, Reptile | | Product Dimensions | 5 x 2 x 9 inches; 1.43 pounds | | Target Species | Aquatic Plants | | UPC | 810089840295 | | Unit Count | 16 Fluid Ounces | ## Product Details - **Brand:** Pond Logic - **Item Form:** Liquid - **Item Weight:** 0.65 kg - **Liquid Volume:** 16 fluid ounces - **Number of Packs:** 1 ## Images ![Airmax Knockdown Defense 2-in-1 Pond Algae & Weed Control, 16 fl oz | Fast-acting algaecide and aquatic weed treatment helps clear ponds and lakes with an easy-to-use liquid formula - Image 1](https://m.media-amazon.com/images/I/51OUdezWiuL.jpg) ![Airmax Knockdown Defense 2-in-1 Pond Algae & Weed Control, 16 fl oz | Fast-acting algaecide and aquatic weed treatment helps clear ponds and lakes with an easy-to-use liquid formula - Image 2](https://m.media-amazon.com/images/I/71eiodQk1+L.jpg) ![Airmax Knockdown Defense 2-in-1 Pond Algae & Weed Control, 16 fl oz | Fast-acting algaecide and aquatic weed treatment helps clear ponds and lakes with an easy-to-use liquid formula - Image 3](https://m.media-amazon.com/images/I/71lwkq+iKWL.jpg) ![Airmax Knockdown Defense 2-in-1 Pond Algae & Weed Control, 16 fl oz | Fast-acting algaecide and aquatic weed treatment helps clear ponds and lakes with an easy-to-use liquid formula - Image 4](https://m.media-amazon.com/images/I/71SkDLtD8rL.jpg) ![Airmax Knockdown Defense 2-in-1 Pond Algae & Weed Control, 16 fl oz | Fast-acting algaecide and aquatic weed treatment helps clear ponds and lakes with an easy-to-use liquid formula - Image 5](https://m.media-amazon.com/images/I/61eeIG+ZPhL.jpg) ## Available Options This product comes in different **Color, Size** options. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sg/products/472415247-airmax-knockdown-defense-2-in-1-pond-algae-and-weed](https://www.desertcart.sg/products/472415247-airmax-knockdown-defense-2-in-1-pond-algae-and-weed) --- *Product available on Desertcart Singapore* *Store origin: SG* *Last updated: 2026-07-27*