I know this thread is a little old, but I was reading it because I am thinking about building my own PBW but without using Oxyclean free. Mainly because I don't like the foaming. I'm thinking of getting sodium percarbonate from this site:
http://www.soapgoods.com/product_info.php?products_id=1001 . They also have EDTA, TSP substitute should be fairly easy to find locally. And it looks like that same site has Sodium Laurel Sulfate which is the same as SDS.
61% Sodium percarbonate/carbonate - main cleaning agent
30% TSP/90 (Sodium Metasilicate) - lowers pH/caustic
5% EDTA - chelator
4% SDS/SLS - surfactant
I don't necessarily need the chelator as I've never had the spotting problems, but I would like to have a relatively low foaming surfactant in the solution.
I'm getting close, and so far cost is under $2/lb which is a great price.
Anyone know where to get sodium metasilacate cheap/bulk?
Would SLS possibly foam too much? It is used in household soaps for it's ability to lather.