Hi Tom,

Here in Hawaii we have always had water that is relatively clorine free. That is all about to change with a new law that now requires its use in all drinking water. I have used Seachem prime in the past and although it is relatively inexpensive, when you have alot of fishtanks perofrm alot of wter changes it does add up. I have heard of a chemical that can supposedly neutralize bleach and remove chlorine (Sodium thiosulfate). I did a search on this forum and got back only two threads that mention it, but neither thread actually tells how it is used.

Can sodium thiosulfate be used to remove chlorine from tap water and if so how is it used? Would I have to make a stock solution first and then add 5mL or is it added dry?

Any information would be greatly appreciated.

Thanks,

Ken Takeuchi

Yes, that's what used for chlorine. But if they use chloramine, then you cannot use it.
Stick with Prime/Amquel etc.

It's not that much and if you want to reduce cost etc, run the tap through a carbon filter.

Regards,
Tom Barr

Hi i use a product called chloram X, it is very economical ( 1 tsp per 10 glns), see link below for more details.

Welcome to the ClorAm-X web site
Regards

I specifically asked the board of water supply what they will be using and they told me chlorine. I asked if they will be using Chloramines and they said no.

Carbon filters that attach to the tap aren't very efficient at removing chlorine/chloramine......unless you have the larger industrial size filters with lower flow rate, the contact time with the carbon just isn't long enough to do much at all.

When you have well over 100 tanks, a bottle of prime doesn't last very long and shipping to hawaii is very expensive. If there is a dry form that is relatively easy to use I would rather use that........especially if the chemical is relative inexpensive.

Thanks for the help.

Ken T.

Since it's definitely Cl, you can use a clear well, aeration etc to drive it off for a few hours first prior to use. 100 tanks is a lot and that would remove it also.
Sodium Thiosulfate should work fine.

Regards,
Tom Barr

Hi Tom,

Thank you very much for the response thus far. By any chance do you know the dosage of sodium thiosulfate (how much weight or volume/gallon)? I would prefer this method over having to aerate the water which would require a rather large container and a seperate pump. Although a clear well would most likely be cheaper in the long run I don't think it would be practical.

Thanks,

Ken T.