As I understand it ( ? ) hydrogen peroxide is used to kill off any pathogens in the system.
The drug store peroxide contains preservatives and clearly states not for internal use.
The food grade peroxide is quite expensive and has a short shelf life.
Copper tubing also kills off pathogens and is a one time purchase.
So, I installed copper tubing between my
pump and plastic tubing (about a foot of it) and it seems to works pretty well.
Just my two cents worth.