What's the Deal with H202?
If you frequent microgreens forums, you have probably come across growers mentioning H202. H202, also known as peroxide, found in brown bottles in just about everyone's medicine cabinet, is a great tool to have in your grow room or greenhouse. H202 is an unstable solution, so additives are added to the mixture to increase the shelf-life. The main difference between food grade peroxide and household peroxide is the presence of those chemical additives.
Typically you will find household H202 in a 3% concentration. It's stored in a brown container to help with shelf stability along with the additives we mentioned before (i.e., Tin, Sodium stannate & Nitrates).
Generally, it comes in a 35% concentration but can be found in lower concentrations (3%, 12%). The main difference between the food grade and the household peroxide is the absence of stabilizing additives. We recommend using this type of peroxide for food and plant applications. The concentration of 35% is far too strong to use for most cleaning, but this concentration can be diluted down to 3% and be ideal for most applications.