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I would like to learn more about using sodium thiosulfate to neutralize bleach.
For example, let's say I wanted to dose 100ppm chlorine into a 40 gal QT for disinfection of Cryptocaryon and other microbes. According to this chart, I would need to use (roughly) 1 Cup of 8.25% sodium hypochlorite: http://dec.vermont.gov/sites/dec/files/dwgwp/DW/chlorinedosageemergencydisinfection.pdf
In 24 hours I am ready to remove all chlorine from the tank, so according to this information provided by @bblumberg I would use about 34 grams of sodium thiosulfate for 40 gal/150L of water @ 100ppm chlorine: https://www.edspumps.com/water-treatment/documents/Antichlorination.pdf
Now, if my math is right (34 grams/40 gals = 850mg/gal = 224.5mg/L or ppm), then I am exceeding the 100ppm limit of sodium thiosulfate which can be safely used with fish. Or does most of the sodium thiosulfate dissipate soon after dosing or get used up when neutralizing chlorine? What about the remaining Thiosulfate after the Sodium is bonded to the Chlorine from the bleach?
@Randy Holmes-Farley @Christoph
For example, let's say I wanted to dose 100ppm chlorine into a 40 gal QT for disinfection of Cryptocaryon and other microbes. According to this chart, I would need to use (roughly) 1 Cup of 8.25% sodium hypochlorite: http://dec.vermont.gov/sites/dec/files/dwgwp/DW/chlorinedosageemergencydisinfection.pdf
In 24 hours I am ready to remove all chlorine from the tank, so according to this information provided by @bblumberg I would use about 34 grams of sodium thiosulfate for 40 gal/150L of water @ 100ppm chlorine: https://www.edspumps.com/water-treatment/documents/Antichlorination.pdf
Now, if my math is right (34 grams/40 gals = 850mg/gal = 224.5mg/L or ppm), then I am exceeding the 100ppm limit of sodium thiosulfate which can be safely used with fish. Or does most of the sodium thiosulfate dissipate soon after dosing or get used up when neutralizing chlorine? What about the remaining Thiosulfate after the Sodium is bonded to the Chlorine from the bleach?
@Randy Holmes-Farley @Christoph