Obviously these crystals are used by folks who want to take a spiritual bath or do a traditional floor-scrubbing of their home (or workplace, or wherever).
But you can also use bath crystals in situations where liquid deployment of the formula is desired but oils are impractical, too messy, or too expensive. Don't coat all of your doorknobs or windowsills with oil - dissolve bath crystals and use the water for that kind of thing. Moistening an envelope flap with oil could leave suspicious and unattractive oily marks; using water with crystals dissolved in it is better. Using your used bathwater to moisten it might be even better, depending on the work and who's receiving the envelope.
Downloadable instructions are available from the Education link in the top menu.
Resealable packets contain app. 3 ounces of crystals by weight (weight will vary slightly depending on ingredients, as some are denser than others). One packet contains enough bath crystals for three full tub baths or three large mop buckets of floor wash. Use less for smaller spaces, laundry rinse, and stand-up/basin baths.
LEGALESE: As required by law, all items are sold as curios to preserve and teach the traditions of folklore and popular religion. I don't sell anything I don't use myself, though, and quite a few customers over the years have sworn by my traditional formulas since I started selling them in 2002.