Hot tub/spa supply stores should also have it around 30%. It's used as an oxidizer to clean organic waste from the water.
--- In Homebrew_PCBs@yahoogroups.com, "designer_craig" <cs6061@...> wrote:
>
>
> Fyi,
>
> Was thinking about growing some hydroponic tomatoes this year and took a
> trip over to a local hydroponic supplier. Hand't realized how big an
> industry this is these days. But I am sure its not for tomatoes. Well,
> there on the shelf nex to the Super Bud Juice and the Earth Gold Super
> Grow nutrients were quarts of 27% peroxide. I didn't see the price and
> then forgot to ask. Didn't have etching suplies in mind at the time.
>
> Craig
>
>
>
>
>
> [Non-text portions of this message have been removed]
>