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Used to be in the grocery store when people did more home pickling.
Could be hard to find..check old time pharmacies too.
Used it on the Yukon and Green Rivers with good results.
Size does matter. Too little or too much and nothing happens
On two different Yukon 1000 canoe races, we used the PurReliance chemical system to both de-silt and purify our drinking water. Did not need to filter. It worked well for us. A 6-man voyageur canoe needs lots of water to paddle 1000 miles. We purified 5 gallons at a time. Two small packets does it. I carried alum as a backup, but didn't use it.