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Epiphany

Tim Stapp

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Dec 21, 2012
Messages
561
Location
Big Rapids, MI
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4x5 Format
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."
 
27 Feb 2019

Tim:

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

Regards,
Darwin
 
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.
 
drpsilver said:
27 Feb 2019

Tim:

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

Regards,
Darwin
Click to expand...
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.
 
Great hype for hypo!
 
koraks said:
Even more interesting: ammonium thiosulfate is used as a fertilizer.
Click to expand...
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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