My ST is clear looking cylindrical crystals. The instructions that came
with it was to mix it, 500 grams (slightly over a 1.1 pounds) with one
gallon of deionized water, and that would treat 18,000 plus gallons. I use
hose water, a postage scale to measure the ST, and make about 5 or 6 gallons
at a time. I think that 1 ounce treats about 150 gallons of water, and I
generally use double or triple, because it is so cheap. I bought a 50 pound
bucket, around $60.
--
RichToyBox
http://www.geocities.com/richtoybox/pondintro.html

"Bill Stock" wrote in message
...
I just bought a 5 lb pail of Sodium Thiosulphate for the pond/aquariums.
The instructions I have read here in the past suggest that this should be
enough to dechlorinate lake Superior. But reading the bucket, it states
that I need anywhere between 1/4 tsp and 1 tsp of raw ST per 5 gallons of
pond water. This means that a 250 gallon water change would take up to 50
tsps. Given that the bucket only contains about 5 cups, that's 10 water
changes.

The stuff in the bucket looks like some sort of crystal, not a powder. Has
this stuff been bound with some other chemical to reduce it's strength? At
this rate it's no cheaper than the generic slime coat. Bummer.