The second one does not show what they are selling. I would always advise food grade however, I have used none food grade and the difference as far as I can tell is none food grade has stabilising chemicals in it to make it last longer without any obvious problems. Perhaps ask the second supplier what their difference is. You are lucky, here in the UK we can only buy 12% max strength without a licence. We can however buy peroxide in 5 liter poly containers and even larger containers for around £23 delivered about $28 I think.What I see being my biggest gripe would be finding 35% peroxide in bulk at reasonable prices+shipping.
I prefer to buy in bulk when possible. I did find 2 places online:
https://www.blubonic.com/product-pa...2ytyZqywiHKlD5UhqgB3psRVF_Mx7G8hoCl1IQAvD_BwE
https://www.asecurecart.net/server/cart.aspx/PureHealthDiscounts
Which would you purchase for long-term usage? I bought my original from Pure Health Discounts, but if there really isn't a difference between the 2, I am going to order from BluBonic.com