Re: sodium thiosulfate

[Gary Rich]

Joan wrote:
> I read on here that we could use sodium thiosulfate, which is no doubt
> cheaper than buying regular Pond DeChlorinator.
>
> Where do you buy it and how much do you use?
>
> Thanks---

You can get it at any photo/darkroom supply place. Probably costs
1/10th what it costs from a pond place.

[DavidM]

> According to Doc Johnson, you want to be sure to obtain fish safe
> aquaculture (not the penta-anhydrous form of photo hypo). I just bought
the
> 50 pound container from Aquatic Eco for $52 plus shipping, which should
> treat about 1.5 million gallons of water. That should last me for a few
> years. Compared to the about $50 per gallon for material to treat 37,000
> gallons, that I went through about 4 of a year.
> --

The Doc fails to tell us what the formula is for fish safe sodium
thiosulfate.

In our lab, we have Sodium Thiosulphate 5-Hydrate, which is hydrated rather
than anhydrous. This would be the logical alternative to the hydrated fish
harming variety, anybody know if this is what he recommends?
David