United States Pharmacopeia (USP) Grade Epsom Salt
Magnesium sulfate can be used in bath salts and floatation therapy, where high concentrations raise the bath water's specific gravity. It is also used to prepare foot baths and is great for soothing sore feet. The magnesium sulfate can also be absorbed into the skin, reducing inflammation. Also available: USP Grade with FREE SHIPPING / Epsom Salt Technical Grade (Tech Grade is OMRI Certified)
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I bought almost 30 bags for our new float tank. It dissolved quickly and we have had no problems at all with the salt itself. It came on a pallet that was left in my driveway because we have a slight incline to get up to the garage and the truck couldn't accommodate that. No big deal.
The only issue is the material the bags are made of. You need to be careful to not throw them around. We had one arrive with a small split in the bag just big enough for us to notice some sprinkling, but not big enough to be concerned about. We smacked on some packing tape and all was good. However, by the time we moved the bags from the front yard to the back yard, then into the float room, then back out to the main room to bring in the tank and back to the float room again, 5 more had split, some almost an inch. Mind you, we were just dropping them or tossing them.
I would not use the bag material issue as a reason not to purchase this item though. When I need more, I will definitely be using this seller again.