---
product_id: 433963794
title: "CrystalClear AlgaeOff String Algae Killer for Pond & Water Garden, 8 lbs | Scum Cleaner Waterfall & Rock Slime Remover Green Stain Treatment EPA Registered Algaecide Plant, Koi Fish, Bird & Pet Safe"
brand: "crystalclear"
price: "€ 167.53"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.pt/products/433963794-crystalclear-algaeoff-string-algae-killer-for-pond-and-water-garden
store_origin: PT
region: Portugal
---

# Fast-acting EPA registered formula Copper-free, wildlife safe Oxygen technology for odor & algae control CrystalClear AlgaeOff String Algae Killer for Pond & Water Garden, 8 lbs | Scum Cleaner Waterfall & Rock Slime Remover Green Stain Treatment EPA Registered Algaecide Plant, Koi Fish, Bird & Pet Safe

**Brand:** crystalclear
**Price:** € 167.53
**Availability:** ✅ In Stock

## Summary

> 🌊 Clear your pond, clear your mind — algae doesn’t stand a chance!

## Quick Answers

- **What is this?** CrystalClear AlgaeOff String Algae Killer for Pond & Water Garden, 8 lbs | Scum Cleaner Waterfall & Rock Slime Remover Green Stain Treatment EPA Registered Algaecide Plant, Koi Fish, Bird & Pet Safe by crystalclear
- **How much does it cost?** € 167.53 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/433963794-crystalclear-algaeoff-string-algae-killer-for-pond-and-water-garden)

## Best For

- crystalclear enthusiasts

## Why This Product

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

## Key Features

- • **Odor Neutralizer:** Boosts oxygen levels to remove foul pond odors 💧
- • **Temperature-Resilient:** Effective year-round, enhanced by warm weather for rapid results
- • **Versatile Application:** Perfect for ponds, waterfalls, streams, and large water gardens
- • **Eco-Friendly & Fish-Safe:** Copper-free formula protects koi, goldfish, and pond wildlife 🌿
- • **Instant Algae Annihilation:** Works on contact to eliminate string algae in seconds ⚡

## Overview

CrystalClear AlgaeOff is an EPA registered granular algaecide designed for rapid, on-contact removal of string algae in ponds, waterfalls, and water gardens. Utilizing advanced oxygen technology, it not only kills algae but also eliminates foul odors without harming fish or wildlife, thanks to its copper-free formula. Ideal for both small backyard ponds and large water bodies, it works effectively across all temperatures and is easy to apply for a pristine aquatic environment.

## Description

CrystalClear AlgaeOff is an EPA registered granular algacide that works on contact! AlgaeOff utilizes the latest in oxygen technology to remove and kill string algae quickly and efficiently on rocks, stream beds, pond liners, and waterfalls.
In addition to string algae control, CrystalClear AlgaeOff adds oxygen to your pond and removes odors. Great for use in ponds containing koi and goldfish.
Water Gardens:
Apply AlgaeOff algae remover directly over the infested area in granular form. Surface should be wet or water should be applied immediately following application. For waterfall applications, turn off waterfall pumps and allow AlgaeOff  algae remover to sit on the waterfall for a period of 20 minutes and then turn pumps back on.
Skim the dead algae or organic material that rises to the water's surface after treatment. This will keep dead organics from sinking to the bottom of the pond. Dead and decaying organics provide a food source and additional nutrients for future algae blooms. Allow 48 hours between consecutive treatments.
For liquid applications, please follow all label instructions. Due to solubility, AlgaeOff is not as effective with this application method.
Ponds & Lakes:
Treat floating or submerged algae mats evenly from shoreline out. If the majority of your pond is covered during hot weather or when treating heavy growth, it is important to treat no more than 1/4 of your pond at a time and wait the full 14 days before re-applying. This helps lower the risk of fish loss during hot weather or when treating heavy growth. Heavy growth may require re-treatment.
When to Apply
AlgaeOff algae remover should be used any time string algae has accumulated on rocks, streams and waterfalls. Water temperature has no effect on AlgaeOff  algae remover but higher temperatures enhance effectiveness. Great for use in ponds containing koi and goldfish.
Precautions
After application, do not allow undiluted AlgaeOff granular algaecide granules to remain in an area where humans or animals are exposed. Make sure all granules have been sprayed with water to fully dissolve.
Usage Near Wildlife
To ensure that this product will be not harm any wildlife, we recommend diluting the powdered AlgaeOff granular algaecide in a 5 gallon bucket prior to entering the pond. This product can only harm wildlife if the granular is left undiluted / doesn't come in to contact with water so as long as this product is diluted in the water, birds and pets can drink out of the water feature without harm. We recommend keeping the lid on the product when not in use to prevent birds or other animals from digesting the granular out of the container.
Does AlgaeOff work on all algae types?
AlgaeOff works on contact to kill string algae, also known as hair algae. You can also use AlgaeOff on floating algae mats. It will not treat planktonic algae that causes green water or Chara. If you're looking for broad spectrum algae control, consider CrystalClear Algae D-Solv.
Is there a temperature restriction on this product?
No, there are no water temperature restrictions on this product. However, it is advised to use AlgaeOff in warmer temperatures when algae is actively growing. Sunlight and higher temperatures both enhance AlgaeOff’s effectiveness.
Can I use this when my waterfall is running?
It is recommended to turn off your water feature (including pump, waterfall, fountain, etc.) when applying this product as it works on contact. Effects of this treatment will be immediately apparent (bubbling, bleaching/discoloration of algae).
Can this product be used in my large, acreage-sized pond?
Yes, AlgaeOff is an EPA registered algaecide that can be used to treat string algae and floating algae mats in large ponds and lakes. See label for dosage and application methods. This product is not recommended for planktonic algae or Chara.
Will this algae remover harm my fish?
AlgaeOff does not contain copper. When used as directed, AlgaeOff is great for backyard ponds containing koi, goldfish, grass carp, and other fish. Will not harm animals when diluted in water. Always use in accordance with the label directions.
Can I get rid of algae without hurting my water lilies?
Yes, AlgaeOff will not harm ornamental plants when used as directed.

## Features

- Controls Algae in Ponds -- AlgaeOff algae remover works on contact! Utilizing the latest in oxygen technology to remove and kill string algae quickly and efficiently on rocks, streams, and waterfalls.
- EPA Registered Algaecide -- AlgaeOff is a fast-acting EPA registered granular algae remover that works in seconds! In addition to string algae control, it removes foul odors.
- Fast Acting, Works on Contact, Easy Application -- Simply sprinkle granular formula directly on areas covered in live algae. For a waterfall or fountain, turn off the water pump and apply treatment.
- Kills Algae Fast -- Immediately removes & lifts string algae. A great solution for pond clean-outs, rocks, and liners. Use in large ponds and lakes with algae mats. Will not treat planktonic algae or Chara.
- Will Not Harm Wildlife -- Does not contain copper! When used as directed, AlgaeOff is great for backyard ponds containing koi, goldfish, and grass carp. Will not harm animals when diluted in water.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Asin | B09RKHVDY4 |
| Best Sellers Rank | #35 in Water Garden & Pond Treatment |
| Date First Available | January 31, 2022 |
| Manufacturer | Airmax |
| Package Dimensions | 3.94 x 1.97 x 1.18 inches; 8 pounds |

## Product Details

- **Brand:** CrystalClear
- **Item Form:** Powder
- **Item Weight:** 8 Pounds
- **Manufacturer:** Airmax
- **Unit Count:** 1.0 Count

## Images

![CrystalClear AlgaeOff String Algae Killer for Pond & Water Garden, 8 lbs | Scum Cleaner Waterfall & Rock Slime Remover Green Stain Treatment EPA Registered Algaecide Plant, Koi Fish, Bird & Pet Safe - Image 1](https://m.media-amazon.com/images/I/813GyAI1aKL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works fast
*by  on Reviewed in the United States August 16, 2026*

This Item was packaged properly, shipped promptly and was as described. Functionality was better than expected

### ⭐ Toxic to birds - listing description is inaccurate!
*by  on Reviewed in the United States July 19, 2026*

The Amazon listing says this product is safe for birds, fish and pets, but the label clearly says "this product is toxic to birds." I would absolutely not have purchased this if I had thought it was toxic to the wid birds who drink out of my pond. Also toxic to bees. Very, very disappointed. Returning.

### ⭐⭐⭐⭐⭐ It's a magical algae remover
*by  on Reviewed in the United States March 21, 2025*

I'm not saying it's magic but it is absolutely something! I've used it two times within this week both times after just a few minutes algae starts coming to the top for you to scoop it out. I've kept my pumps running and after I scooped out what I can scoop out it usually settles on top of the lid and I'm able to clean it all out. Water looks disgusting while it's going on but once the pumps run for a while it goes back to Crystal Clear and none of my fish or frogs have died. Definitely recommend if you have algae growth it's obviously doing something to it.

## Frequently Bought Together

- CrystalClear AlgaeOff Pond & Water Garden Scum Cleaner, Waterfall & Rock Slime Remover, String Algae Killer, Green Stain Treatment, EPA Registered Algaecide, Plant, Koi Fish, Bird & Pet Safe, 8 lbs
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- API POND ALGAEFIX Algae Control 32-Ounce Bottle, FISHAQUARI (169G)

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*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-09-09*