|By Nan (Nanook) on Monday, October 15, 2001 - 10:02 am:|
H2O2 is Hydrogen Peroxide: a water molecule with an unstable oxygen atom attached. When
Hydrogen Peroxide breaks down it "fizzes" while the unstable oxygen is released. The free oxygen atom is lethal to
some contams, primarily Cobweb Mold. H2O2 is used as a mild disinfectant on Casings, Cakes, and it
has been used to sanitize Perlite. It is employed to "clean up" some Cloning Teks. And it is used in some processes for the pasteurization of straw for some Straw Teks. H202 Kills
P. Cubensis Spores - While it does not give a good spore kill with species
such as Trich, Black Mold... many other mold spores are resistant to H2O2. Read:
What Peroxide Does Not Do
Buy the standard 3% solution Hydrogen Peroxide at the grocery/drug/discount store first aid dept.
Use H2O2 full strength in a spray bottle against cobweb: it is highly effective on cased beds and cakes; properly used it does not permanently harm mycelia. H2O2 is not effective against Trich.
[Used Perlite can be cleaned up by rinsing well in tap water, then soaking for 30 minutes in a solution of one part Hydrogen Peroxide poured into nine parts Clean Water, drain before use.] Personally this sanitizer mix is too mild for this application in my opinion, but it is a traditional formula.
Hydrogen Peroxide use is "ad-lib" in most Grow Chambers, and even in some cloning Teks. Follow the TEK directions as closely as possible when H2O2 is specified.
Given a choice, in most applications I find 2-3 drops of tincture of iodine in a liter of clean water to be a more effective, more persistent, sanitizer. 25 ppm iodine solution in clean water (no debris or floaties) will kill 99.9% of the contams (and their spores) in 20 mins, it's persistent - lasting several days, and the solution is mild enough you can wash mycelia with it.
Sanitizers : Sanitizing : Shroom Glossary
Also See: Peroxide Manual Vol. I & Peroxide Manual Vol. II