It is sold at the Temple of Sesrumnir in Rachel as a necessity for places where clean water is scarce, such as deserts and volcanoes. Mass production seems impossible.
At first glance, it looks like an ordinary medicine bag, but when immersed in water, it instantly glows and purifies. Have fun visiting.

[iRO Description]
An important necessity in places where clean water is lacking, such as deserts and volcanoes.
You can find it being sold in Rachel, and it seems impossible to mass produce it.
At first glance, it looks like an ordinary bag of medicine, but when placed in water, it instantly glows and purifies.
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