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 27 reviews Average Rating 4.81 stars out of 5
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  • J
    Joseph Zachwieja J. Z. Joseph Z.

    The bag was cut.

    The bag was cut so I had to put it in another container.

  • V
    Vasile Stremciuc V. S. Vasile S.

    💯 excellent

    Copper Sulfate Crystals

  • J
    JOHN Buerger J. B. JOHN B.

    Quick delivery

    Looks good...

  • g
    gary williams G. W. gary w.



  • J
    Jeff Pike J. P. Jeff P.

    Copper Sulfate Chrystals

    Always excellent product and great shipping!

  • P
    Pamela Newman P. N. Pamela N.

    Needed 2 shipments

    Ordered 40 lbs. Of CuSO4. Only 20 lbs. arrived in first shipment. Called and second 20 lbs was shipped overnight. That's great service. Thanks.

  • T
    Tom Brown T. B. Tom B.

    Copper Sulfate

    Very speedy delivery and well protected packaging.

  • G
    Gary ODell G. O. Gary O.

    As described

    Needed the “rocksalt” size crystals for root control - these are perfect thanks!

  • C
    C R Brasington C. R. B. C R. B.

    Double packaging for waterproofing

    Splendidly done.

  • T
    Terry Gross T. G. Terry G.


    Great job guys

  • C
    Charles Stearman C. S. Charles S.

    Great product, great communication

    Great product, great communication

  • C
    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.

  • p
    patrick brenner P. B. patrick b.

    Copper sulfate

    Product was received in good order

  • R
    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.

  • M
    Mian Mahmood M. M. Mian M.

    Price costly

    Price too much extra quality was good

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