I want to prove it.

[Anubias]

Some days one might get 0.3 ppm residual chloramine at the tap; other days, 1.3 or more. This will also vary from location to location within the city depending upon the distance from the treatment facility. There are seasonal changes in the amount of organic matter in the water pipes which will react with the chloramine in the lines thus reducing it. The pH of the water to which you add the sodium thiosulfate also determines the amount of said product that is needed to remove the chloramine.

All in all, it will be very difficult for you to generalize from the results of your experiment.

There are very precise amounts of sodium thiosulfate required to remove each ppm of chloramine from the water at a set pH. I just do not have those figures anymore although I tried to find them on the Web.

There is a fellow in Montreal who buys sodium thiosulfate in bulk powder form for peanuts. He's a breeder. He could probably tell us the required amount. I still rue the day that the City moved to chloramine, August 9, 1992. What a foolish decision!

Regards,

[artw]

Aug 9 2004?  that was only a month and a half ago.  

[Anubias]

Corrected.