In the UK you have to be VAT registered to buy 35% otherwise 12% is the strongest we can buy legally anyway. Always best to buy high strength peroxide and dilute it to your required strength with RO and post DI if you have it.Thanks for the quick response and compliment!!! I might try to find some 35% and dilute down. I was running an ozone generator, but had to switch to a Reef Octopus from my Vertex (which has an intake for ozone).
