---
product_id: 19409425
title: "Crystal Blue Copper Sulfate Algaecide - Granular Aquatic Grade Copper Sulfate for Pond Algae Control - 5 Pounds"
brand: "crystal blue"
price: "560 Lei"
currency: RON
in_stock: true
reviews_count: 8
category: "Crystal Blue"
url: https://www.desertcart.ro/products/19409425-crystal-blue-copper-sulfate-algaecide-granular-aquatic-grade-copper-sulfate
store_origin: RO
region: Romania
---

# Designed for large aquatic environments Targets actively growing algae above 60°F 99% pure Copper Sulfate Pentahydrate Crystal Blue Copper Sulfate Algaecide - Granular Aquatic Grade Copper Sulfate for Pond Algae Control - 5 Pounds

**Brand:** crystal blue
**Price:** 560 Lei
**Availability:** ✅ In Stock

## Summary

> 🌿 Clear waters, zero compromises — own your pond’s pristine look!

## 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?** 560 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/19409425-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

- • **Rapid Clarity Boost:** Works best on thick floating algae mats, clearing your pond quickly without harsh chemicals.
- • **Aquatic-Grade Purity:** 99% pure granular formula ensures maximum potency and consistent results.
- • **Precision Algae Control:** Effectively eliminates filamentous and string algae for crystal-clear water.
- • **Eco-Conscious Application:** Use responsibly to protect fish species sensitive to copper sulfate like Koi and Goldfish.
- • **Optimized for Large Ponds:** Formulated specifically for expansive water bodies, not small decorative ponds or pools.

## Overview

Crystal Blue Copper Sulfate Algaecide is a premium 99% pure granular treatment designed for large ponds and aquatic environments. It effectively controls a wide range of algae species, especially during warm water conditions above 60°F, delivering rapid water clarity while requiring mindful application to protect sensitive fish.

## Description

desertcart.com : Crystal Blue Copper Sulfate Algaecide - Granular Aquatic Grade Copper Sulfate for Pond Algae Control - 5 Pounds : Pond Water Treatments : Patio, Lawn & Garden

Review: This is a great product ! - 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: Copper Sulfate Algaecide - 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 |
|---------------|-------|
| Best Sellers Rank | #12,254 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #23 in Water Garden & Pond Treatment |
| Brand | Crystal Blue |
| Customer Reviews | 4.4 out of 5 stars 2,358 Reviews |
| Global Trade Identification Number | 00768980003335 |
| Item Form | Granules |
| Liquid Volume | 5 Liters |
| Manufacturer | Sanco Industries |
| UPC | 768980003335 |

## 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/81cWa2gCfkL.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

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

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

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

### ⭐⭐⭐⭐⭐ Does what it says it will do
*by C***E on November 16, 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
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**Shop now:** [https://www.desertcart.ro/products/19409425-crystal-blue-copper-sulfate-algaecide-granular-aquatic-grade-copper-sulfate](https://www.desertcart.ro/products/19409425-crystal-blue-copper-sulfate-algaecide-granular-aquatic-grade-copper-sulfate)

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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-02-17*