Hi all,
Had occasion to set up my electrolytic deruster again today (commonly known as a benchtop 12V power supply, a big Rubbermaid tote, and an old piece of sprinkler pipe bodged together with some wire and alligator clips) and I noticed that I'd apparently used it enough that my supply of washing soda was getting low. I don't remember where I purchased it last time but I don't remember it being unusually hard to find. Well, after hitting two grocery stores and several chain hardware stores, I was starting to get a bad feeling. Arm and Hammer's web site was useless as they don't show any local retailers to me and their "contact us" form doesn't seem to actually work.
So I stopped by a local pool service place and the guy was happy to sell me a quantity of soda ash but I'd have to bring my own container as they only stock it in large bags (although depending on price I'd be happy to buy one of those as well.)
Question is, I know that they are both ostensibly sodium carbonate. Is there any meaningful difference in washing soda intended for use as a detergent ingredient (in case I'd want to use it for same) and soda ash used as a pH balancer for swimming pools, e.g. additives, allowable levels of impurities, other? Or is it really just two different names for the same thing?
I'm definitely going back to the pool supply but wondering if I should get a small container or just grab a 5 gal. bucket and get a lifetime (or at least a decade's worth) supply.
nate