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mixing physan 20

This is a discussion on mixing physan 20 within the General Orchid Culture forums, part of the Orchid Culture category; How much physan 20 for just one gallon of water----bottle says 2tsp for 20 gallons...

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  1. #1
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    Default mixing physan 20

    How much physan 20 for just one gallon of water----bottle says 2tsp for 20 gallons

  2. #2
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    That would be 1 tsp per 10 gallons, so would be 0.1 tsp per gallon. That equates to about 1/2 of a ml (milliliter) per gallon. If you have access to a smaller syringe that is in ml, that would probably the easiest way to measure.

    Susan
    Last edited by orchidlady; July 30th, 2010 at 11:10 AM.

  3. #3
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    Thanks Susan!

    Cheers,
    BD

  4. #4
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    Thanks for the info Susan.

  5. #5
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    I think its supposed to be 2 tsp per gallon or water. I just checked my physan 20 and thats what the instructions say

  6. #6
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    I have to agree with Raver. While I don't use Physan 20 made by Maril Products, Inc, 320 West 6th Street, Tustin, CA 92780 1-800-546-7711, I do use the competition, SA 20 made by Southern AG. It is EXACTLY the same chemical formulation. For use on orchids as a disinfectant, fungicide and algae control, the recommended concentration is 2 TEASPOONS / gal of water. I spray everything in the greenhouse; plants, pots, benches, greenhouse glass and floors about every 3 weeks or so.

  7. #7
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    i spray mine on a monthly basis, every 4 weeks or so =)

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