Copper Sulfate Crystals

Seed Barn

Copper Sulfate Crystals 

  • A versatile farm chemical:
  • Pest control - snails and slugs
  • Pond cleaner - algae, mosquito larvae
  • Natural fungicide mildew
  • Antiseptic - household germs
  • Organic Bordeaux mix - blight, apple scab, leaf curl, etc.);
  • Remove old tree stumps (bore a hole and insert
  • Kill roots clogging septic tank pipes - flush down the toilet.
  • Wood and canvas preservative (prevents dry rot),

...or simply grow lovely blue crystals.

 Usage: For pipeline systems (toilets, etc.) - 1 cup down drains every 2 weeks or 2 cups per month. 

Customer Reviews

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Based on 18 reviews Average Rating 4.8 stars out of 5
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  • Verified buyer
    Terry Gross T. G. Terry G.


    Great job guys

  • Verified buyer
    Charles Stearman C. S. Charles S.

    Great product, great communication

    Great product, great communication

  • Verified buyer
    Carl Messana C. M. Carl M.

    Copper Sulfate - Algae Killer

    Had filamentous algae in my lake along the shorelines, so I hand spread the copper sulfate and within 2 days the algae started to disappear and by the 5th day it was totally gone. Lake water also cleared up as a result.

  • Verified buyer
    patrick brenner P. B. patrick b.

    Copper sulfate

    Product was received in good order

  • Verified buyer
    Richard Downer R. D. Richard D.

    Great seller

    Received order just as promised, have not used crystals yet. Came with brief very helpful instructions. All aspects have exceeded our expectations .They went the extra mile to satisfy us and did.

  • Verified buyer
    Mian Mahmood M. M. Mian M.

    Price costly

    Price too much extra quality was good

  • Verified buyer
    Deborah Muhl D. M. Deborah M.

    Very satisfied.

    Very satisfied.

  • Verified buyer
    jeri liggett J. L. jeri l.

    crystals arrive!

    Thank-you for the shipment, all was well. We have applied it to the problem.

  • Verified buyer
    Sheri Naus S. N. Sheri N.

    Copper sulfate

    Prices are good for copper sulfate, ordering was easy, shipping was prompt, and the sulfate was delivered within a few days.

  • Verified buyer
    Willie Thomas W. T. Willie T.

    Root killer

    Yes this product works great thank you for your help will be ordering again...

  • Verified buyer
    Don Bunker D. B. Don B.

    Good price, good shipping.

    Everything worked fone

  • Verified buyer
    William Gerrells W. G. William G.

    Copper sulfate for pond.

    Pleased with your service and the product ordered. Very good service.

  • Verified buyer
    Linda C Reed L. C. R. Linda C. R.

    Pond Algae

    Every year we get mat algae that starts in February. I have found that this product, which I apply at low levels, knocks back the algae before it gets started. This particular size is excellent for distribution where I need it to go. I walk the bank of the pond and put it in the areas algae is growing. I applied the product and within 24-48 hours I saw a notable difference. As the temperature warms I may need to hit spots, but the initial application was exactly what I expected. We really don't see excessive algae other than around the perimeter, but I may treat areas in the interior pond if we have an outbreak. I'll order it again. Very quick shipping too.

  • Russell J. R. J. Russell J.

    Super store

    Product received quickly.

  • Verified buyer
    Kristine Williams K. W. Kristine W.


    Can always count Seed World for great service. Thanks

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