---
product_id: 107473470
title: "Hydrothol Aquatic Herbicide 20# Bag- Endothol 11%"
brand: "united phosphorus inc"
price: "B/.633"
currency: PAB
in_stock: true
reviews_count: 8
category: "United Phosphorus Inc"
url: https://www.desertcart.com.pa/products/107473470-hydrothol-aquatic-herbicide-20-bag-endothol-11
store_origin: PA
region: Panama
---

# Fast-acting aquatic weed control Covers 1000 sq ft water surface 11.2% Endothall concentration Hydrothol Aquatic Herbicide 20# Bag- Endothol 11%

**Brand:** united phosphorus inc
**Price:** B/.633
**Availability:** ✅ In Stock

## Summary

> 🌿 Clear waters, clear mind — conquer pond weeds like a pro!

## Quick Answers

- **What is this?** Hydrothol Aquatic Herbicide 20# Bag- Endothol 11% by united phosphorus inc
- **How much does it cost?** B/.633 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.pa](https://www.desertcart.com.pa/products/107473470-hydrothol-aquatic-herbicide-20-bag-endothol-11)

## Best For

- united phosphorus inc enthusiasts

## Why This Product

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

## Key Features

- • **Rapid Results:** Visible weed and algae clearance within days at optimal water temps
- • **Broad Coverage:** Effectively treats up to 1000 sq ft of lakes, ponds, and drainage canals
- • **Easy Application:** Granular form spreads effortlessly for hassle-free treatment
- • **Eco-Conscious Formula:** Safe for aquatic life when used as directed, preserving your ecosystem
- • **Precision Aquatic Control:** Targets stubborn pondweed and algae without harming fish

## Overview

Hydrothol Aquatic Herbicide delivers 11.2% Endothall in a 20-pound granular bag, expertly formulated to control aquatic weeds and algae across 1000 square feet of water surfaces such as lakes, ponds, and drainage canals. Trusted for its fast action and fish-safe profile, it’s the go-to solution for maintaining pristine aquatic environments with minimal effort.

## Description

Hydrothol

Review: Works well on curly leaf pondweed - Seems to work on curly leaf pondweed -- especially when treated early enough (about 50F water temp).
Review: Pond Problem Solver - Cleared out stubborn algae in just a few days. Easy to spread and works fast without harming the fish.

## Features

- Endothall 11.2%
- Drainage canals, lakes and ponds
- Aquatic Weed Control

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00QXNR7AE |
| Active Ingredients | Herbicide |
| Best Sellers Rank | #41,465 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #97 in Water Garden & Pond Treatment |
| Brand | United Phosphorus Inc |
| Brand Name | United Phosphorus Inc |
| Coverage | 1000 square feet |
| Customer Reviews | 4.1 out of 5 stars 459 Reviews |
| Global Trade Identification Number | 39270356680801 |
| Item Form | Granules |
| Item Weight | 20 Pounds |
| Liquid Volume | 9463.52 Milliliters |
| Manufacturer | United Phosphorus Inc |
| Unit Count | 320.0 Ounce |

## Product Details

- **Brand:** United Phosphorus Inc
- **Item Weight:** 20 Pounds
- **Liquid Volume:** 9463.52 Milliliters
- **Item Form:** Granules
- **Active Ingredients:** Herbicide

## Images

![Hydrothol Aquatic Herbicide 20# Bag- Endothol 11% - Image 1](https://m.media-amazon.com/images/I/71WYmtf4dlL.jpg)

## Questions & Answers

**Q: Does this kill water shield, cat tails, willows and algae ?**
A: Hi...yes it does kill water shield, cat tails and other water vegatation as long as you get it spread in close proximity to the base of those plants...not sure about the willows, suspect not because they are above the water.  I prefer to keep a little patch of ws and ct so I carefully spreading the granular product allowing me to do that.  For algea no...different type of animal...I used Cutrine Plus...spray on algea after it forms...works great other than I have to spray it 4-5 times during the year to keep it under control.  Looking for a different product that you toss in and it prevents the algea from starting.

**Q: Will this kill Hydrilla?**
A: I used this for leafy pond grass and it kills numerous other. It also takes care of algae.
My pond has never looked as clean as it does now.

**Q: Do you just throw it in on the algae? I'm asking because mine is broken up in sections I already applied another product and it helped a little but I**
A: That is what we did.  This stuff sinks and gets to the roots.. about a week Lily pads started to look burnt and drying up.

**Q: River application + I live o. A river in Maine, will this work on weeds under the water?**
A: Hydrotho Granular aquatic herbicide and algaecide for ponds provides rapid-acting contact control for submerged weeds and algae. Hydrothol even works where there is moving water such as a canal or bay area. Hydrothol can be used in combination, in rotation or as an alternative to copper for control of algae. Dosage rates vary depending on what type of algae or weed is being treated and the density of the infestation.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works well on curly leaf pondweed
*by J***R on December 26, 2025*

Seems to work on curly leaf pondweed -- especially when treated early enough (about 50F water temp).

### ⭐⭐⭐⭐⭐ Pond Problem Solver
*by A***N on August 9, 2025*

Cleared out stubborn algae in just a few days. Easy to spread and works fast without harming the fish.

### ⭐⭐⭐⭐ Weeds gone
*by C***N on July 1, 2025*

Why did you pick this product vs others?: Works great on lake weeds. Unfortunately expensive and takes a full bag to do the job.

## Frequently Bought Together

- Hydrothol Aquatic Herbicide 20# Bag- Endothol 11%
- Airmax MuckAway Natural Beneficial Bacteria for Outdoor Ponds & Lakes, Muck, Sludge & Noxious Odor Solution, Easy to use Enzyme Tablets, Cleaner Beach & Shoreline, Fish, Pet & Wildlife Safe, 8 Scoops
- Cutrine-Plus Granulated Algaecide - 30 lbs. 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 Panama*
*Store origin: PA*
*Last updated: 2026-03-01*