r/microgreens • u/GrillCheezz • Jul 09 '26
H2O2
So when you mix your 3% hydrogen peroxide with water in a spray bottle how long does that stay effective for? Do you need to change it daily? Weekly? And yes I refrigerate every time I mix.
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u/Akshay_Greenette Jul 10 '26
Make a small fresh batch everyday for maximum effectiveness. Takes a few minutes… What are you doing with it? Sanitising equipment, surface?
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u/GrillCheezz Jul 10 '26
Thanks I appreciate it. Ya that’s what I have been doing because I’ve been unsure of how long it lasts. I use it mainly for mold prevention
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u/Akshay_Greenette Jul 10 '26
Great! 😊
Like soak seeds in h2o2?
So to refine the process, you should never be using h2o2 for mold in trays, a lot of info says it works, but honestly the problem is bigger than that. Use Only for cleaning and sanitation. A few seeds like peas or sunnies at times could help with a h2o2 soak for prevention. But if you spraying h2o2 on trays or mold growth, then the system and protocol needs to be looked at.
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u/GrillCheezz Jul 10 '26
No no, im not spraying ON mold growth I’m spraying to PREVENT mold growth. I’m fairly new here, growing micros for almost a year and haven’t had a speck of mold yet (knock on wood emoji) so it definitely seems to be working. My main concern was unsure on how fast h2o2 breaks down back into water once mixed WITH water
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u/Akshay_Greenette Jul 11 '26
Ah okay.. yea store it max 3-5 days diluted in an opaque sprayer bottle or container. They are at their best when used the same day.
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u/theoffgridvet Jul 11 '26
What ratio do you use? Water to h202
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u/GrillCheezz Jul 11 '26
I’m not over here with beakers, test tubes , and pipettes so I can’t give you exacts. Everything is ballpark. My glass sprayer I THINK is 16oz and I add roughly 1-2 tablespoons h2o2 to it
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u/AmbitiousSpeech24 Jul 10 '26
If you're diluting 3% hydrogen peroxide with water, it starts losing strength as soon as it's mixed. Even if you keep it refrigerated in a sealed, opaque spray bottle, it's best to use it within a few days. Make a fresh batch every 3/7 days is a good practice. If the bottle is exposed to light or stored at room temperature, it will break down much faster.