---
product_id: 716496065
title: "Crystal Blue Copper Sulfate Algaecide - Granular Aquatic Grade Copper Sulfate for Pond Algae Control - 5 Pounds"
brand: "crystal blue"
price: "₩301820"
currency: KRW
in_stock: false
reviews_count: 5
category: "Crystal Blue"
url: https://www.desertcart.kr/products/716496065-crystal-blue-copper-sulfate-algaecide-granular-aquatic-grade-copper-sulfate
store_origin: KR
region: South Korea
---

# Designed for large aquatic environments 99% pure Copper Sulfate Pentahydrate Fish-safe with species restrictions Crystal Blue Copper Sulfate Algaecide - Granular Aquatic Grade Copper Sulfate for Pond Algae Control - 5 Pounds

**Brand:** crystal blue
**Price:** ₩301820
**Availability:** ❌ Out of Stock

## Summary

> 🌿 Clear your pond, not your peace of mind!

## Quick Answers

- **What is this?** Crystal Blue Copper Sulfate Algaecide - Granular Aquatic Grade Copper Sulfate for Pond Algae Control - 5 Pounds by crystal blue
- **How much does it cost?** ₩301820 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/716496065-crystal-blue-copper-sulfate-algaecide-granular-aquatic-grade-copper-sulfate)

## Best For

- crystal blue enthusiasts

## Why This Product

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

## Key Features

- • **Eco-Conscious Usage:** Treat half the pond at a time to protect oxygen levels and aquatic life
- • **Precision Algae Control:** Targets filamentous & string algae with surgical accuracy
- • **Trusted Quality & Volume:** 5 lbs granular formula with 4.4-star rating from 2,265 pros
- • **Optimized for Active Growth:** Works best above 60°F on thriving algae mats
- • **Flexible Application Methods:** Broadcast, bag-drag, or dissolve & spray for tailored treatment

## Overview

Crystal Blue Copper Sulfate Algaecide is a premium 99% pure granular formula designed for effective control of filamentous and string algae in large ponds. Ideal for use in water temperatures above 60°F, it offers versatile application methods and ensures safe treatment when used responsibly, avoiding harm to sensitive fish species. Trusted by thousands, this 5-pound aquatic-grade solution balances powerful algae elimination with ecosystem care.

## Description

Crystal Blue Copper Sulfate is a great pond algae control product for filamentous or string algae. Copper sulfate should be used as a pond algae treatment on actively growing algae in water temperature above 60F. When getting rid of algae in a pond, it is always important to treat 1/2 of the pond algae at a time to avoid killing too much algae and depleting the water of oxygen. Copper sulfate is safe for most varieties of fish (see restrictions below) when used properly. Granular copper can be applied in one of three different ways: broadcast crystals, place crystals in a burlap bag and drag behind boat, or dissolve crystals and spray. The application method we recommend is to dissolve the crystals in hot water and spray actively growing algae.

Review: Copper Sulfate Algaecide
Review: Does what it says it will do

## Features

- 99% Copper Sulfate Pentahydrate. To be used for large bodies of water, not small decorative ponds, water features, or pools.
- Controls most species of algae like filamentous, string algae and swimmers itch. Copper Sulfate should be used as a pond algae treatment on actively growing algae in water temperature above 60F.
- Most effective when cast out on top of thick floating algae mats. Be aware of how much vegetation you are treating at one time. Eliminating too much at once can deplete the oxygen levels too quickly for your fish.
- Granular Copper Sulfate, 5 lbs
- DO NOT use in bodies of water that include Koi, Goldfish, Trout, or Grass Carp. These types of fish are sensitive to copper sulfate products.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000RUN0T6 |
| Allergen Information | Abalone |
| Brand | Crystal Blue |
| Brand Name | Crystal Blue |
| Customer Reviews | 4.4 out of 5 stars 2,265 Reviews |
| Global Trade Identification Number | 00768980003335 |
| Included Components | Copper Sulfate |
| Item Form | Granules |
| Item Type Name | Algaecide |
| Item form | Granules |
| Item height | 10 inches |
| Liquid Volume | 5 Liters |
| Liquid volume | 5 Liters |
| Manufacturer | Sanco Industries |
| Target Species | Fish |
| UPC | 768980003335 |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** Crystal Blue
- **Item form:** Granules
- **Liquid volume:** 5 Liters
- **Manufacturer:** Sanco Industries
- **UPC:** 768980003335

## Images

![Crystal Blue Copper Sulfate Algaecide - Granular Aquatic Grade Copper Sulfate for Pond Algae Control - 5 Pounds - Image 1](https://m.media-amazon.com/images/I/51a+8ZuejOS.jpg)
![Crystal Blue Copper Sulfate Algaecide - Granular Aquatic Grade Copper Sulfate for Pond Algae Control - 5 Pounds - Image 2](https://m.media-amazon.com/images/I/71YkeRUWSLS.jpg)
![Crystal Blue Copper Sulfate Algaecide - Granular Aquatic Grade Copper Sulfate for Pond Algae Control - 5 Pounds - Image 3](https://m.media-amazon.com/images/I/81cWa2gCfkL.jpg)
![Crystal Blue Copper Sulfate Algaecide - Granular Aquatic Grade Copper Sulfate for Pond Algae Control - 5 Pounds - Image 4](https://m.media-amazon.com/images/I/81eqtwFCHYL.jpg)
![Crystal Blue Copper Sulfate Algaecide - Granular Aquatic Grade Copper Sulfate for Pond Algae Control - 5 Pounds - Image 5](https://m.media-amazon.com/images/I/918JNcg6RaL.jpg)

## Questions & Answers

**Q: Is copper safe to use with fish?**
A: This product is safe for livestock, recreation, potable water and not harmful to most fish when used according to label directions. There are a few exceptions, Copper sulfate is not meant for small deco ponds and is toxic to Koi, Golfish and Trout.

**Q: How often should I use Copper Sulfate?**
A: Copper sulfate algae control should be used when algae is present. Wait 14 days between applications and only treat a 1/2 or 1/3 of the pond at a time to recover oxygen levels.

**Q: How do I apply this product?**
A: Apply by casting granulars, dragging behind boat in burlap, or dissolve and spray.

**Q: How much product do I use?**
A: 1.8 lbs of copper will treat up to 15,000 square feet.

**Q: When is the best time to treat my pond algae?**
A: Pond algae should be treated when algae is actively growing and water temperatures are above 60F.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Copper Sulfate Algaecide
*by F***Y on 2 December 2025*



### ⭐⭐⭐⭐⭐ Does what it says it will do
*by C***E on 16 November 2025*



### ⭐⭐⭐⭐⭐ This is a great product !
*by M***H on 3 August 2025*



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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-01-28*