Hi Guys
I use Prochems Oxibrite aas a source of hydrogen peroxide, just dissolve in warmish water and it will form hydrogen peroxide, which will decompose into water and oxygen, which is the bleaching agent.
5 Kg will lasyt you about 15 years!
Some prefer already mixed/diluted hydrogen peroxide but there is little point in buying different strengths, just dilute it with water!
2H2O2 decomposes to 2H2O and O2
Cheers
Doug