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This is worth understanding. The 35% concentrate, stored properly in a cool dark place, will last around a year. Once you dilute it, the clock starts ticking much faster.
As a rough guide:
If your diluted solution stops fizzing on a stain or contact with organic matter, it's lost its potency and it's time to mix a fresh batch. The good news: a 500ml bottle of 35% gives you roughly 12 refills of a 3% spray bottle, so you're never really running out.
What's the difference between 35% food grade and 3% from the chemist?
The food grade 35% is free from stabilisers and additives that are added to pharmacy-grade 3% hydrogen peroxide to extend its shelf life onshop shelves. Those stabilisers are fine for first aid but not something most people want near food preparation surfaces or produce. The 35% concentrate is also dramatically more economical - one 500ml bottle replaces roughly twelve 500ml pharmacy bottles.
Can I buy it already diluted?
Yes. We stock a pre-diluted 3% x 1 Litre for anyone who'd rather skip the mixing step. It's the same food grade product, just ready to use out of the bottle. Many first-time customers start here and move to the 35% concentrate once they're confident with it.
Is there a smaller size of the 35%?
Yes. We also stock 35% in 100ml and 200ml - good for first-timers who want to try it before committing to the larger size.
Disclaimer
Since this product is used for various different reasons, it is highly recommended to do your own independent research for your particular purpose of use. By Australian law, our company cannot provide any medical or therapeutic advice in regards to the use of Hydrogen Peroxide.