---
product_id: 6004172
title: "Sonar RTU (Ready-to-Use) Aquatic Herbicide 1 Quart, Systemic Weed Control for Duckweed and More - No Mixing or Equipment Needed - EPA Approved, Season-Long Treatment, Safe for Fish & Wildlife"
brand: "sepro"
price: "£134.88"
currency: GBP
in_stock: true
reviews_count: 8
category: "Se Pro"
url: https://www.desertcart.co.uk/products/6004172-sonar-rtu-ready-to-use-aquatic-herbicide-1-quart-systemic
store_origin: GB
region: United Kingdom
---

# Season-Long Systemic Control EPA Approved & Safe for Wildlife 1 Quart Ready-to-Use Liquid Sonar RTU (Ready-to-Use) Aquatic Herbicide 1 Quart, Systemic Weed Control for Duckweed and More - No Mixing or Equipment Needed - EPA Approved, Season-Long Treatment, Safe for Fish & Wildlife

**Brand:** sepro
**Price:** £134.88
**Availability:** ✅ In Stock

## Summary

> 🌿 Pour, Protect, Prevail — Pond Perfection Made Simple!

## Quick Answers

- **What is this?** Sonar RTU (Ready-to-Use) Aquatic Herbicide 1 Quart, Systemic Weed Control for Duckweed and More - No Mixing or Equipment Needed - EPA Approved, Season-Long Treatment, Safe for Fish & Wildlife by sepro
- **How much does it cost?** £134.88 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/6004172-sonar-rtu-ready-to-use-aquatic-herbicide-1-quart-systemic)

## Best For

- sepro enthusiasts

## Why This Product

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

## Key Features

- • **Precision Dosing:** Treats ½ acre (4-6 ft depth) with just 4 quarts—maximum impact, minimal effort.
- • **Trusted & Proven:** Highly rated by users for rapid, visible pond transformation.
- • **Eco-Friendly & Safe:** EPA approved formula that protects fish, pets, and wildlife.
- • **Effortless Application:** No mixing, spraying, or boats needed—just pour and relax.
- • **Powerful Systemic Action:** Targets duckweed and submerged weeds for a cleaner pond all season.

## Overview

Sonar RTU is a ready-to-use, EPA-approved aquatic herbicide designed for easy, no-fuss control of duckweed and submerged vegetation. Safe for fish and wildlife, it delivers season-long systemic weed control with a simple pour application—no equipment or mixing required. Ideal for residential ponds, farms, and lakes, it treats up to half an acre with just 4 quarts, ensuring a cleaner, healthier aquatic environment.

## Description

Product description Sonar RTU Ready-To-Use Aquatic Herbicide Sonar RTU (Ready-to-Use) represents an exciting era in pond weed management tools for the do-it-yourselfer! The innovative RTU formulation allows anyone to make water usable for recreation, bring fish populations back into balance, and restore property values. It's so simple that applying Sonar RTU doesn't require any mixing, special spray equipment, or a boat...open the bottle and treat from the shoreline. Sonar RTU and Duckweed Many pond owners consider duckweed to be their toughest aquatic weed problem. Duckweed is a very common nuisance aquatic weed that is spread from pond to pond via waterfowl or other wildlife. While it is commonly mistaken for algae, duckweed is actually a tiny plant with an explosive reproductive capacity that can completely cover a pond in just a few weeks to the point that the infested pond resembles a golf-course green. Fortunately, no other aquatic herbicide is more effective on duckweed. Sonar RTU provides complete, long-lasting control of duckweed and other stubborn unwanted aquatic vegetation. Sonar RTU Features Easy to apply No mixing, no spray equipment, no boat. Sonar RTU is a ready-to-use liquid that pours directly into pond from the shoreline. How Sonar RTU works Sonar RTU is taken up by stems, leaves, and roots of susceptible plants and inhibits the plants ability to produce food. This diagram illustrates how Sonar RTU translocate through the entire plant. Use precautions There are no fishing, swimming, livestock, and pet consumption restrictions for Sonar RTU. Check the label for irrigation precautions. Used by the professionals Sonar RTU herbicide contains Fluridone - the #1 active ingredient used by professional aquatic applicators nationwide. Sonar RTU Specifications

Review: Patience is key - Followed the instructions for a 1/2 acre pond, 2 quarts initially, then 1 more after 3 weeks and another quart 3 weeks after that. No changes for 2 months, started to feel ripped off, then magically within 5 days the pond was clear of all algae. Pretty amazing stuff.
Review: Works on small pond - I have a small backyard koi pond of approx. 800 gallons that got duckweed a couple of years ago from some plants I had ordered on eBay. This product is expensive but I hadn’t found a better option, so I bought a bottle and did the math to determine that I needed to add a whopping 3 ml. I double checked my work and got the same answer. So I used a syringe that had come with an inkjet refill kit, shook the bottle, sucked 3 ml out, and squirted it into the pond. It remained kind of congealed so I did mix it into the water. A week later and the duckweed turned light in color and started to die off. I skimmed most of it off and it’s obvious that it is no longer spreading. I’ll reapply in a couple of weeks per the directions but I stand amazed that 3 ml was this effective. It does not appear to be affecting my 3 koi at all.

## Features

- No Mixing, No Spray Equipment, or Boat needed
- The most simple DIY systemic herbicide you can buy, just pour in the right dose directly into the pond
- EPA Approved and Non-toxic for fish, pets, and wildlife, so it’s good for use in residential ponds, farms, and lakes
- Easy to dose just use 4 quarts per 1/2 acre (4-6ft depth avg)
- Due to compliance with state regulations, shipments to AK, CT, HI, ME, NJ, NY, WA, and Canada are not permitted. Orders from these states will be voided

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004XWS5DU |
| Best Sellers Rank | #26,971 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #195 in Weed Killers |
| Brand | SePRO |
| Brand Name | SePRO |
| Coverage | 1 quart treats 1/8th of an acre of water for the entire season |
| Customer Reviews | 4.2 out of 5 stars 431 Reviews |
| Item Form | Liquid |
| Item Weight | 2.2 Pounds |
| Liquid Volume | 1 Quarts |
| Manufacturer | SePRO Corporation |
| Model Number | SonRTU |
| Part Number | SonRTU |
| UPC | 811055010933 |
| Unit Count | 32.0 Fluid Ounces |

## Product Details

- **Brand:** SePRO
- **Item Form:** Liquid
- **Item Weight:** 2.17 Pounds
- **Liquid Volume:** 1 Quarts
- **UPC:** 811055010933

## Images

![Sonar RTU (Ready-to-Use) Aquatic Herbicide 1 Quart, Systemic Weed Control for Duckweed and More - No Mixing or Equipment Needed - EPA Approved, Season-Long Treatment, Safe for Fish & Wildlife - Image 1](https://m.media-amazon.com/images/I/716pWdgNfeL.jpg)
![Sonar RTU (Ready-to-Use) Aquatic Herbicide 1 Quart, Systemic Weed Control for Duckweed and More - No Mixing or Equipment Needed - EPA Approved, Season-Long Treatment, Safe for Fish & Wildlife - Image 2](https://m.media-amazon.com/images/I/81XRbfOhcKL.jpg)
![Sonar RTU (Ready-to-Use) Aquatic Herbicide 1 Quart, Systemic Weed Control for Duckweed and More - No Mixing or Equipment Needed - EPA Approved, Season-Long Treatment, Safe for Fish & Wildlife - Image 3](https://m.media-amazon.com/images/I/815yh+soMvL.jpg)
![Sonar RTU (Ready-to-Use) Aquatic Herbicide 1 Quart, Systemic Weed Control for Duckweed and More - No Mixing or Equipment Needed - EPA Approved, Season-Long Treatment, Safe for Fish & Wildlife - Image 4](https://m.media-amazon.com/images/I/61XadXFMURL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Patience is key
*by J***C on April 26, 2026*

Followed the instructions for a 1/2 acre pond, 2 quarts initially, then 1 more after 3 weeks and another quart 3 weeks after that. No changes for 2 months, started to feel ripped off, then magically within 5 days the pond was clear of all algae. Pretty amazing stuff.

### ⭐⭐⭐⭐⭐ Works on small pond
*by G***G on July 20, 2024*

I have a small backyard koi pond of approx. 800 gallons that got duckweed a couple of years ago from some plants I had ordered on eBay. This product is expensive but I hadn’t found a better option, so I bought a bottle and did the math to determine that I needed to add a whopping 3 ml. I double checked my work and got the same answer. So I used a syringe that had come with an inkjet refill kit, shook the bottle, sucked 3 ml out, and squirted it into the pond. It remained kind of congealed so I did mix it into the water. A week later and the duckweed turned light in color and started to die off. I skimmed most of it off and it’s obvious that it is no longer spreading. I’ll reapply in a couple of weeks per the directions but I stand amazed that 3 ml was this effective. It does not appear to be affecting my 3 koi at all.

### ⭐⭐⭐⭐ Slow working - but a great product.
*by M***N on August 18, 2015*

Finally, after 40 days the duck weed is gone! After my first application (1 quart for a 1/4 acre pond) the duck weed grew faster and multiplied like crazy. I thought surely I was feeding the duck weed and not killing it, but I call the company that make this product and they assured me the Sonar was going to work but I had to be patient and let it do it's job and BINGO, after 40 days the duck weed was gone. I am thrilled!

## Frequently Bought Together

- Sonar RTU (Ready-to-Use) Aquatic Herbicide - 1 Quart Systemic Herbicide for Duckweed, Hydrilla and Most Difficult Aquatic Weeds, No Equipment Needed, Simply Pour in for Season Long Control
- Aquashade 1-Gallon Pond Treatment – EPA-Approved Blue Dye for Weed & Algae Suppression | Eco-Friendly, Non-Toxic, and Safe for Aquatic Life, Livestock, and Wildlife
- Cutrine-Plus Liquid Algaecide - 1 Gallon Professional-Grade Algae Killer for Lakes & Ponds, EPA Approved to Control All Types of Algae (Planktonic, Filamentous, and Chara)

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*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-05-15*