Epiphany

Tim Stapp · Feb 27, 2019

My job takes me into many different facilities. Today, I was in a chemical plant that produces/packages pool chemicals. For those that question the purity of pool chemicals for photo use, rest assured. On the dock was a pallet load of Sodium Thiosulphate. The bags were labeled as "Sodium Thiosulphate Pentahydrate-Photo Grade."

drpsilver · Feb 28, 2019

27 Feb 2019

Tim:

Thanks for the information. My question: How is sodium thiosulphate used in pool chemistry?

Regards,
Darwin

mshchem · Feb 28, 2019

Tim Stapp said:
My job takes me into many different facilities. Today, I was in a chemical plant that produces/packages pool chemicals. For those that question the purity of pool chemicals for photo use, rest assured. On the dock was a pallet load of Sodium Thiosulphate. The bags were labeled as "Sodium Thiosulphate Pentahydrate-Photo Grade."

Not bad no doubt. The best hypo crystals I've ever seen were made by (or for ) Eastman Kodak in the good old days. I have bought nice stuff off Ebay nice penta-hydrate crystals, still there's just the tiniest bit of grit that I let settle out and decant off the solution. But your point is well taken.

AgX · Feb 28, 2019

drpsilver said:
How is sodium thiosulphate used in pool chemistry?

see here:
https://americanpool.com/glossary/sodium-thiosulfate/

darkroommike · Feb 28, 2019

drpsilver said:
27 Feb 2019

Tim:

Thanks for the information. My question: How is sodium thiosulphate used in pool chemistry?

Regards,
Darwin

Used as a dechlorinator, also used in tiny amounts to dechlorinate aquariums when starting a new tank. If you look up the wiki for sodium thiosulfate it lists other uses too.

Sirius Glass · Feb 28, 2019

Great hype for hypo!

koraks · Mar 1, 2019

Even more interesting: ammonium thiosulfate is used as a fertilizer.

Anon Ymous · Mar 1, 2019

koraks said:
Even more interesting: ammonium thiosulfate is used as a fertilizer.

And it works a treat. I should also add that it keeps very well in this form, better than a typical acidic fixer.

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