Homebrew PCBs

On Tue, 2010-03-30 at 15:55 +0100, Howard Payne wrote: 
> Hi
> The ingredients as on the bottle are:
> Aqua, Hydrogen Peroxide, Sodium Salicylate, Pentasodium  Pentate and
> Phosphoric Acid. It is 6% 20vol in a 1ltr bottle
> 
> Would any of these things that are in it, make it foam up (frothy) when i
> use the air pump ??

Resuming the top query results from google on Pentasodium Pentate:
It's a metal chelating agent that 'inactivates' copper or metals in hard
water "creating superior foaming and cleaning performance."