--- product_id: 33535475 title: "Copper Sulfate Small Crystals 10lb Bag" brand: "dawinsie" price: "1319 kr" currency: DKK in_stock: true reviews_count: 8 url: https://www.desertcart.dk/products/33535475-copper-sulfate-small-crystals-10lb-bag store_origin: DK region: Denmark --- # Hydroponic Approved 99.9% Pure USA Made Copper Sulfate Small Crystals 10lb Bag **Brand:** dawinsie **Price:** 1319 kr **Availability:** ✅ In Stock ## Summary > 🌟 Elevate Your Growth Game with Pure Precision! ## Quick Answers - **What is this?** Copper Sulfate Small Crystals 10lb Bag by dawinsie - **How much does it cost?** 1319 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/33535475-copper-sulfate-small-crystals-10lb-bag) ## Best For - dawinsie enthusiasts ## Why This Product - Trusted dawinsie brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Unmatched Purity:** Experience 99.9% pure copper sulfate for optimal results. - • **Consistent Quality:** Each crystal measures 3-5 MM for uniformity in use. - • **Eco-Friendly Choice:** Sourced and manufactured in the USA for sustainability. - • **Hydroponic Essential:** Perfectly approved for hydroponic systems, ensuring plant health. - • **Versatile Applications:** Ideal for gardening, agriculture, and educational experiments. ## Overview Our Copper Sulfate Small Crystals come in a 10lb bag, featuring 99.9% purity, hydroponic approval, and consistent 3-5 MM crystal sizes, all proudly made in the USA. Perfect for a variety of applications, this product is a must-have for professionals and enthusiasts alike. ## Description Shipped in a factory sealed plastic bag that is sealed for safety and freshness. Ships lightning fast! For all your non-EPA uses. ## Features - 99.9% Pure - Bulk - Hydroponic Approved - USA Made - 3-5 MM Crystals ## Product Details - **Brand:** DAWINSIE - **Item Weight:** 10 Pounds - **Percentage assay:** 99.9 - **Item Form:** Liquid - **Manufacturer:** Earthworks Health LLC ## Images ![Copper Sulfate Small Crystals 10lb Bag - Image 1](https://m.media-amazon.com/images/I/51PHWjWXlRL.jpg) ## Questions & Answers **Q: Can this product be used to spray on carbon steel to turn it a cooper patina color?** A: yes, copper sulfate is used in the formula to make copper patina. You do have to acidify the copper sulfate a little more to do this. **Q: does it work on dead roots** A: When I make recommendations regarding copper sulfate I am referring to our EPA labeled bags as those are registered to kill tree roots, algae, and be a fungicide in some cases. Copper sulfate will work to clear tree roots from the drain but if they are already dead and in excess, it will be a good idea to roto-rooter those out. Use copper sulfate twice a year to help prevent further growth. **Q: How much would you use to prevent roots in a main sewer line? And frequency?** A: I use 1/2 of the package once per month....and it seems to reduce the likelihood of the roots from going as fast, but they ultimately grow in the sewer line and always end up having to have it rooted at some point, which is much more costly...so this helps me to not have to do the rooting as often by adding a half bag every month. **Q: how do i apply it to kill tree stumps?** A: Copper Sulfate will not kill/rot tree stumps. Copper Sulfate can be used to kill trees via the tree's roots. To kill /rot tree stumps, drill a few holes in the stump and carefully pour in batery acid. It will take a year or two. Otherwise, you can dig out the stump or pay a tree stump rooter. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Keeps weeds out of my pipes *by H***I on May 2, 2025* Been using for about 3 months..Seems to be working ..Have had no roots entering my pipes so far this year. ### ⭐⭐⭐⭐⭐ it works *by D***N on June 18, 2024* The price is good. The performance is very good. I use for algae control for my pond and root control for my septic lines. It does not hurt my fish( follow directions)Tip: If you have an access to your drain lines(septic), add it there. Otherwise if you add it to your tanks you will need to retreat them with enzymes in 2 weeks. You need good bacteria in your septic system. This product is an algaecide, it works. I recommend it. Oh and from what I can find it is non hazardous and not a chemical. ### ⭐⭐⭐⭐⭐ If you need this for root kill maintenance, try this method. *by D***1 on March 7, 2018* I have an ongoing problem with roots from two red maples in my front yard-sewer line runs right in between them. Was having to have it snaked almost every three months. I first purchased a 1lb bag copper sulfate from a local hardware store first to see how it would work, and the guy there gave me a great way to use it. Dump about 1lb in an old panty hose leg, then drape it over the edge of your utility tub, tying the open end to something so that it hangs there, just barely touching the bottom of the tub. Every time you run your washing machine, the rinse water will dissolve and pick up some of the crystals. This puts a small amount of the product down your drain every day or so (depending on how frequently you use your washing machine). This nearly daily deposit will leech out through your drain pipe seam or crack where the roots are getting in and eventually kill the roots in a large area around the pipe. I find I have to refill the panty hose about once a month. Since I have been doing this, snaking the drain has reduced from 4 times a year, to never in the last two years. I bought the 10lb bag from Amazon since it was cheaper per lb than what the HW store charges. ## Frequently Bought Together - Copper Sulfate Small Crystals 10lb Bag - 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 - Copper Sulfate Crystals-10lb Bag (FINE Crystals) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.dk/products/33535475-copper-sulfate-small-crystals-10lb-bag](https://www.desertcart.dk/products/33535475-copper-sulfate-small-crystals-10lb-bag) --- *Product available on Desertcart Denmark* *Store origin: DK* *Last updated: 2026-04-23*