---
product_id: 338926766
title: "Crystal Blue Copper Sulfate Algaecide - Aquatic Grade Granular Pond Algae Control - 5 lbs"
brand: "crystal blue"
price: "8427801₫"
currency: VND
in_stock: false
reviews_count: 5
category: "Crystal Blue"
url: https://www.desertcart.vn/products/338926766-crystal-blue-copper-sulfate-algaecide-aquatic-grade-granular-pond-algae
store_origin: VN
region: Vietnam
---

# 5 lbs granular for large water bodies 99% pure Copper Sulfate Pentahydrate Effective above 60°F water temp Crystal Blue Copper Sulfate Algaecide - Aquatic Grade Granular Pond Algae Control - 5 lbs

**Brand:** crystal blue
**Price:** 8427801₫
**Availability:** ❌ Out of Stock

## Summary

> 🌿 Clear waters, confident ponds — algae doesn’t stand a chance!

## Quick Answers

- **What is this?** Crystal Blue Copper Sulfate Algaecide - Aquatic Grade Granular Pond Algae Control - 5 lbs by crystal blue
- **How much does it cost?** 8427801₫ with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/338926766-crystal-blue-copper-sulfate-algaecide-aquatic-grade-granular-pond-algae)

## 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 maintain oxygen balance and protect aquatic life.
- • **Aquatic Grade Purity:** 99% Copper Sulfate Pentahydrate ensures maximum efficacy without compromise.
- • **Large-Scale Solution:** Designed for expansive ponds, not small decorative features—power where it counts.
- • **Optimized Application:** Dissolve & spray or broadcast granules for flexible, professional-grade treatment.
- • **Precision Algae Control:** Targets filamentous & string algae with surgical accuracy for crystal-clear ponds.

## Overview

Crystal Blue Copper Sulfate Algaecide is a 5 lb granular, aquatic-grade treatment with 99% pure Copper Sulfate Pentahydrate, engineered to control filamentous and string algae in large ponds. Best applied in water temperatures above 60°F, it offers flexible application methods and requires careful dosing to preserve oxygen levels and protect sensitive fish species.

## 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: I have a 400 gallon pond with a waterfall and I always had an algae issue until I bought this. I know I poured a little too much in but I was thinking "what the heck". The pond was cloudy for a few days and then it cleared the water up and now it looks fantastic! Crystal clear. What a great product ! I would highly recommend this to anyone who has a pond with an algae problem !!!
Review: Does the job. Distribute through your toilets. Keeps those lines clear of roots as well as the septic itself.

## 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 |
| Brand | Crystal Blue |
| Country of Origin | USA |
| Global Trade Identification Number | 00768980003335 |
| Item Dimensions LxWxH | 10.2 x 10.2 x 25.4 Centimeters |
| Item Form | Granules |
| Item Weight | 2 kg 240 g |
| Item model number | 333 |
| Liquid Volume | 5 Litres |
| Manufacturer | Sanco Industries |
| Net Quantity | 2365.88 Milliliters |
| Product Dimensions | 10.16 x 10.16 x 25.4 cm; 2.24 kg |
| UPC | 768980003335 |

## Product Details

- **Brand:** Crystal Blue
- **Item Form:** Granules
- **Liquid Volume:** 5 Litres
- **Manufacturer:** Sanco Industries
- **UPC:** 768980003335

## Images

![Crystal Blue Copper Sulfate Algaecide - Aquatic Grade Granular Pond Algae Control - 5 lbs - Image 1](https://m.media-amazon.com/images/I/81cWa2gCfkL.jpg)
![Crystal Blue Copper Sulfate Algaecide - Aquatic Grade Granular Pond Algae Control - 5 lbs - Image 2](https://m.media-amazon.com/images/I/91GCRjvj6lL.jpg)
![Crystal Blue Copper Sulfate Algaecide - Aquatic Grade Granular Pond Algae Control - 5 lbs - Image 3](https://m.media-amazon.com/images/I/918JNcg6RaL.jpg)
![Crystal Blue Copper Sulfate Algaecide - Aquatic Grade Granular Pond Algae Control - 5 lbs - Image 4](https://m.media-amazon.com/images/I/91tdi6FSd3L.jpg)
![Crystal Blue Copper Sulfate Algaecide - Aquatic Grade Granular Pond Algae Control - 5 lbs - Image 5](https://m.media-amazon.com/images/I/91cSwgdy1uL.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

### ⭐⭐⭐⭐⭐ Review
*by M***H on 3 August 2025*

I have a 400 gallon pond with a waterfall and I always had an algae issue until I bought this. I know I poured a little too much in but I was thinking "what the heck". The pond was cloudy for a few days and then it cleared the water up and now it looks fantastic! Crystal clear. What a great product ! I would highly recommend this to anyone who has a pond with an algae problem !!!

### ⭐⭐⭐⭐⭐ Review
*by F***Y on 2 December 2025*

Does the job. Distribute through your toilets. Keeps those lines clear of roots as well as the septic itself.

### ⭐⭐⭐⭐⭐ Review
*by C***E on 16 November 2025*

Works very quickly, easy to use. Wear a mask when spreading this! It got rid of a snail and parasite problem within hours!

## Frequently Bought Together

- Crystal Blue Copper Sulfate Algaecide - Granular Aquatic Grade Copper Sulfate for Pond Algae Control - 5 Pounds
- Blue Lake and Pond Dye - One Gallon of Professional Lake & Pond Dye - Treats Up to 1 Acre - Royal Blue Color - Safe for Fish, Wildlife, Pets & Children
- Crystal Blue Natural Pond Cleaner - Muck and Sludge Remover, Safe for Koi - 1 Gallon

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-03-01*