[Barry]

I see from the plans, I should use USP grade Epsom Salt. Is that different than normal Epsom Salt? If so what is the difference?

[Administrator]

Hello !

You can use Regular Epsom salt, the USP grade
is a quality standard proof about the product.

for more info see this links:
http://scout7.cs.wisc.edu/page/00005775.html http://www.aoa.dhhs.gov/aoa/dir/223.html

[Barry]

So it is more or less a guarentee of quality of the product? Thanks.

[Administrator]

The epsom i get is made in germany and has Epsom Salt-Ph.Eur./USP.