Does Epsom salt keep water from freezing?

Adding salt lowers the freezing point of water. The colder freezing point of seawater makes frostbite a possibility. To approximate the concentration of salt in seawater, you'd have to add about 20lbs (9kg) of Epsom salt to a 6ft tub -- way more than is practical.

morozkoforge.com - Salt Water Cold: How to add magnesium to your ice bath.

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"Is it OK to add Epsom salt to my Morozko?" a new customer asked the other day. It's a really good question, given that most people understand salt will accelerate metal corrosion and the galvanized metal tubs in the Cold and Filtered Forges won't last forever. (The Stainless Forge is chemically indestructible under all practical bathing conditions).

But the answer regrading Epsom salt might surprise you.

Yes, it's fine to add Epsom Salt to your ice bath, and there are some really good reasons why you might want to. Espom salts are safe and fun for your Forge, and may have health benefits by supplementing your magnesium levels , but chloride salts (e.g., table salt, road salt) are not safe and not fun.

How is it OK to add Epsom Salt to a galvanized metal tub?

The chemical name for Epsom salt is magnesium sulfate. It's different from table salt (sodium or potassium chloride), or road salt (calcium chloride), in one very important respect:

Epsom salt does not contain chlorine.

The corrosive power of salt doesn't come from the positively charged ions, like sodium, potassium, iron, or magnesium. It comes from the negatively charged ions, like chlorine. In Epsom salt, the negative ion is sulfate, not chlorine, and the corrosive power of sulfate is much, much less than that of chlorine. So adding sulfate salts to your Forge water is not harmful to the metal, or to your skin. Just don't add chlorine salts, or you risk dissolving away the galvanized coating on your tub -- literally eating away your investment in your Forge.

What are the benefits of an ice bath in Epsom salt water?

Epsom salt was originally extracted from natural mineral waters in Epsom, England and made famous by the wealthy and powerful people who made it fashionable to bath in. The springs were so popular among the 18th century English royals that local entrepreneurs discovered they could concentrate the salt by boiling off the water and sell the resulting crystals for use back in the mansions and palaces occupied by the wealthy when they were not travelling to Epsom. It turns out that the royals of antiquity may have been on to something.

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Because magnesium is a micronutrient essential to long life, and difficult to obtain in an 18th century English diet, bathing in the Epsom baths may have helped extend quality and quality of life for those privileged enough to afford it. Although they didn't know this back in the 1700's, high blood serum levels of magnesium have since been associated with reduced risk of cancer , and improved muscle quality . The extent to which magnesium can be absorbed through the skin during an ice bath is difficult to assess. There are no studies that have attempted to measure dermal absorption of magnesium at the freezing temperatures typical of the Forge. Moreover, the duration of the typical cold plunge is much shorter than the warm bath times that have been studied. Under the most favorable conditions -- warm temperatures to open pores and long exposure times in the bath. The best studies indicate that magnesium does not enter the body through the skin cells, per se -- but it likely does enter through hair follicles and sweat glands. The most extensive resource on transdermal magnesium therapies is by Dr. Marc Sircus ( 2011 ), who suggests that there are many factors that effect how much of anything is absorbed through the skin, including: the concentration applied, the length of contact time, and the total surface area of the body in contact. He never mentions temperature, and the possibility that cold might close up sweat glands and slow absorption, but it seems a reasonable supposition. One way to increase magnesium absorption from your Epsom salt ice bath may be to keep the salt water on your skin during rewarming, and after. That is, don't shower after your ice bath. Towel off instead, rewarm, and leave the salt on your skin for extended absorption throughout the rest of your day, when your sweat glands reopen as you warm. Fresh water freezes at 32F (zero degrees Celsius), which is why your Forge water cannot cause frostbite. Ordinarily, bathing in ice water isn't cold enough to cause your skin to freeze, and that's one of the big advantages of ice baths over cryotherapy for those practicing deliberate cold exposure. On other hand, seawater doesn't freeze until about 30F, because the salt ions in the water interfere with formation of ice crystals. The colder freezing point of seawater makes frostbite a possibility.

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To approximate the concentration of salt in seawater, you'd have to add about 20lbs (9kg) of Epsom salt to a 6ft tub -- way more than is practical. In theory, adding Epsom salt to your Forge could reduce the minimum water temperature, increase thermal discomfort, accelerate hormesis, and also introduce risk of frostbite. In practice, the amounts of Epsom that you're likely to add to your Forge aren't anywhere near enough to have a measurable effect.

The chlorine-ozone connection

Filtered and Stainless Forges are equipped with ozone disinfection systems to reduce the frequency of water changes and keep your water free of pathogenic microorganisms that might cause or spread disease. We do not add chlorine disinfection to the Forge because chlorinated water isn't safe. Ozone is a more powerful oxidant than chlorine, but it is so reactive that it doesn't last very long, Outside the ozone contact chamber inside the mechanical space, actual ozone concentrations in the Forge water are low. Nonetheless, chloride ions accelerate the decomposition of ozone into oxygen, thereby deactivating the disinfection power of ozone. It is this reaction between chlorine and ozone that caused destruction of the stratospheric ozone layer above Antarctica, the emergence of the ozone hole, and the subsequent prohibition on manufacture of chlorinated hydrocarbons.

For salt water cold plunging, use only Epsom salt.

For more information on taking charge of your own physical & mental health, visit the Self-Actual Engineering newsletter at https://seagertp.substack.com/ . For personal stories about journeying through the cold, listen to The Morozko Method podcast https://anchor.fm/adrienne68 .

morozkoforge.com - Salt Water Cold: How to add magnesium to your ice bath.

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