ZeroTol HC Algaecide - 1 Gallon

BioSafe Systems

Zerotol HC Fungicide Algaecide

BioSafe Systems pioneered the development of its proprietary Activated Hydrogen Peroxide with its flagship product, ZeroTol.

Using ZeroTol chemistry, ZeroTol HC is for the backyard gardener, hobby grower including hemp and cannabis production.

Working through oxidation, ZeroTol HC penetrates the cell walls of plant pathogens, killing them instantly. This product has been a staple in farm and ag, turf and ornamental, and greenhouse and nursery industries.

Safe to use, EPA approved, and bee-friendly.

  • Kills Powdery Mildew, Late Blight, Black Spot, and more
  • Kills mold spores before they turn into pathogens
  • Contains no copper or harsh chemicals
  • Leaves no harmful residue
  • Kills diseases on application
  • Biodegradable and Sustainable
  • Increases Yields and Plant Health
  • Promotes Stronger Roots and Stems
  • Use Safely Around People, Animals, Pets, Birds Wildlife
  • Perfect as a curative or regular preventative treatment
  • Capacity: 1 gallon
  • Weight: 8.25 lbs




30 Day Warranty

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  • N
    Nathan Wood N. W. Nathan W.

    Zero-Tol HC purchase/ delivery

    The product ZeroTol HC is an excellant product used to combat mold and clean equiptment with. The ordering/ delivery process I experienced with Seed World was very quick and very smooth. Thank you for the great service

  • R
    Richard Herman R. H. Richard H.

    Best pricing, fast service and shipping.

    Found Seed World online while looking into growing microgreens for personal consumption. Best prices and very happy with speed of service.

  • R
    Richard Padilla Jr R. P. J. Richard P. J.



  • R
    Ralph Gatten R. G. Ralph G.

    ZeroTol HC to Ralph Gatten

    You provided quick service. I have used ZeroTol before, and it is an excellent product. Thanks

  • R
    Ryan Leasure R. L. Ryan L.

    Great shipping

    Extra care taken to make sure it didn’t leak. Fast

  • D
    Diane Perlakowski D. P. Diane P.

    First order

    Good delivery good product. Will keep you in mind for other needs.

  • R
    Richard Rumpf R. R. Richard R.


    Great place. Real fast delivery

  • D
    Davin Jones D. J. Davin J.


    Great timing.....thsnks

  • Westerlind . W. W.


    Good product it actually works

  • M
    Matt Bartlett M. B. Matt B.

    Great product

    Shipping was quick

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