sodium thiosulfate
 

Here is one source:

http://www.aquaticeco.com/aquatic1v1...r=ID1059641337
139705E64&eflag=0&iteminfo4=0&itmid=1613&passitemi d=1613



"Joan" wrote in message news:3f272eaf$1_1@newsfeed...
I read on here that we could use sodium thiosulfate, which is no doubt
cheaper than buying regular Pond DeChlorinator.

Where do you buy it and how much do you use?

Thanks---