--- product_id: 19409425 title: "Crystal Blue Copper Sulfate Algaecide - Granular Aquatic Grade Copper Sulfate for Pond Algae Control - 5 Pounds" brand: "crystal blue" price: "€ 166.60" currency: EUR in_stock: true reviews_count: 8 url: https://www.desertcart.gr/products/19409425-crystal-blue-copper-sulfate-algaecide-granular-aquatic-grade-copper-sulfate store_origin: GR region: Greece --- # Ideal for large bodies of water Fast-acting algae control 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:** € 166.60 **Availability:** βœ… In Stock ## Summary > 🌿 Clear your pond, clear your mind β€” algae doesn’t stand a chance! ## 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?** € 166.60 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/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 - β€’ **Granular Power:** Easy-to-cast granules that settle on thick algae mats for maximum impact - β€’ **Fish-Safe Awareness:** Avoid use with sensitive species like Koi, Goldfish, Trout, or Grass Carp - β€’ **Precision Algae Control:** Targets filamentous, string algae & swimmers itch with surgical accuracy - β€’ **Eco-Conscious Application:** Use on actively growing algae above 60Β°F to protect your aquatic ecosystem - β€’ **Optimized for Large Ponds:** Formulated specifically for expansive water bodies, not small decorative ponds ## Overview Crystal Blue Copper Sulfate Algaecide is a 5-pound granular, aquatic-grade treatment with 99% pure Copper Sulfate Pentahydrate designed for effective algae control in large ponds. It rapidly targets common algae types like filamentous and string algae, working best in water temperatures above 60Β°F. This product is easy to apply on thick algae mats but should be used cautiously to maintain oxygen levels and avoid harm to sensitive fish species. ## Description We offer a complete line of pond maintenance products that will solve almost any pond problem you might have. We believe our products are great and we love empowering end users with the knowledge to successfully transform their bodies of water. Our business began in 1991. Our initial products were developed in kitchen sinks, marketed, sold & delivered from cars. By 1994 the company was incorporated. A warehouse in downtown Fort Wayne replaced a garage and the company hired its first employees. Our focus on marketing products to the end user is what makes us unique. This gives customers the confidence to treat. We love helping pond owners transform their unusable bodies of water into a beautiful retreat worthy landscapes. Copper Sulfate is a granular pond algae control product. This product controls most species of algae like filamentous and string algae. When treating excessive pond growth it is always important to treat half the pond at a time to avoid depleting the oxygen too quickly for the fish. Pets & Wildlife Most Fish Swimming Irrigation Potable Water Copper sulfate is effective on floating algae mats Apply copper every 14 days to keep pond looking beautiful Is copper safe to use with fish? 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. How often should I use Copper Sulfate? 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. How do I apply this product? Apply by casting granulars, dragging behind boat in burlap, or dissolve and spray. How much product do I use? 1.8 lbs of copper will treat up to 15,000 square feet. When is the best time to treat my pond algae? Pond algae should be treated when algae is actively growing and water temperatures are above 60F. Ponds treated with copper can be used recreationally Pets, livestock, and wildlife can use body of water treated with copper sulfate Do not use with goldfish, koi, trout or grass carp due to sensitivities Ponds treated with copper can be used for irrigation STEP 1: POND DYE STEP 2: POND BACTERIA STEP 3: ALGAECIDE When to Apply Apply February-November When to Apply Apply February-November for early season treatment. When to Apply Apply April-September for existing filamentous and planktonic algae control. Benefits Enhances the color of your pond or lake all year long. Benefits Safely and effectively breaks down muck and dead vegetation. Benefits Kills algae and maintains water quality. Products Crystal Blue, Ocean Blue, Sapphire Blue, Black Out, Water Soluble Packets Products Natural Pond Cleaner, Muck Doctor Products Crystal Plex, Copper Sulfate, Bloom Buster, Green X STEP 3: ALGAECIDE STEP 4: SUBMERGED WEED CONTROL STEP 5: EMERGED WEED CONTROL When to Apply Apply April-September for existing filamentous and planktonic algae control. When to Apply Apply April-September for weed control. When to Apply Apply April-September for cattail control. Benefits Kills algae and maintains water quality. Benefits Kills submerged weeds that are copper sulfate resistant. Benefits Kills emerged rooted weeds down to the root. ## 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 | |---------------|-------| | Allergen Information | Abalone | | Asin | B000RUN0T6 | | Best Sellers Rank | #8,291 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden) #16 in Water Garden & Pond Treatment | | Brand Name | Crystal Blue | | Customer Reviews | 4.4 4.4 out of 5 stars (2,464) 4.4 out of 5 stars | | Global Trade Identification Number | 00768980003335 | | Included Components | Copper Sulfate | | Item Form | Granules | | Item Type Name | Algaecide | | Item Weight | 2.24 kg | | Liquid Volume | 5 liters | | Manufacturer | Sanco Industries | | Manufacturer Part Number | 333 | | Model Number | 333 | | Number Of Items | 1 | | Number Of Packs | 1 | | Pet Type | Fish | | Target Species | Fish | | Unit Count | 1 Count | | Upc | 768980003335 | | Warranty Description | See label | ## Product Details - **Brand:** Crystal Blue - **Item Form:** Granules - **Item Weight:** 2.24 kg - **Liquid Volume:** 5 liters - **Number of Packs:** 1 ## 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 ### ⭐⭐⭐⭐⭐ Quick acting and easy to use *by on Reviewed in the United States September 7, 2026* Easy to use and starts working quickly. We love this product for our pond to make the water look great and healthy for the pond ecosystem. Will continue to purchase! ### ⭐⭐⭐⭐⭐ Cleared algae *by on Reviewed in the United States September 10, 2026* Took a couple doses but cleared the pond over a months time ### ⭐⭐⭐⭐⭐ Clear water in two days *by on Reviewed in the United States August 25, 2026* Works great! ## 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 --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.gr/products/19409425-crystal-blue-copper-sulfate-algaecide-granular-aquatic-grade-copper-sulfate](https://www.desertcart.gr/products/19409425-crystal-blue-copper-sulfate-algaecide-granular-aquatic-grade-copper-sulfate) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-10-12*