Walk down the bath aisle of any Australian pharmacy or scroll a marketplace for five minutes and you will find bath salts at every price from four dollars to eighty. Most of the packaging looks lovely. Very little of it tells you what you are actually paying for.
This guide covers what separates a genuinely therapeutic bath salt from coloured table salt in a nicer bag: the salt types that matter, what to look for on the label, and how to work out whether a product is good value.
The Salt Types, Explained
Epsom Salt (Magnesium Sulphate)
The workhorse of therapeutic bathing. Despite the name, Epsom salt is not a salt in the sodium sense at all: it is magnesium bound to sulphate. It dissolves readily, is inexpensive, and is the form most of the research on magnesium bathing has used. If a product contains a high proportion of Epsom salt, that is a good sign.
Magnesium Chloride
Often sold as "magnesium flakes" and usually harvested from ancient seabeds or salt lakes. Magnesium chloride is more bioavailable than Epsom salt and holds moisture against the skin, which makes it a favourite for dry or irritated skin. It costs more, so many budget blends leave it out entirely.
Sea Salt and Rock Salt
Sea salt, Himalayan pink salt, and plain rock salt carry trace minerals and soften water, but they contain little magnesium. They are a fine supporting ingredient and a poor headline act. A product that is mostly sodium chloride is closer to a swim in the ocean than a mineral soak.
Japanese-Style Mineral Blends
Japan's bathing culture produced a different approach: blends designed to recreate the mineral profile of onsen hot springs, usually combining magnesium salts with sodium bicarbonate and botanical extracts. This is the tradition onsen bathing comes from, and the one Miyomi follows.
What to Look For on the Label
- Magnesium salts listed first. Ingredients are listed by proportion. If magnesium sulphate or magnesium chloride is not near the top, you are mostly buying sodium chloride.
- Named botanicals, not "fragrance". Yuzu extract, green tea extract, and essential oils are ingredients. "Parfum" or "fragrance" is a synthetic mystery and a common trigger for sensitive skin.
- A full ingredient list at all. Some marketplace listings never disclose one. In Australia, cosmetic products are required to. No list, no purchase.
- Made in Australia. Local manufacture means fresher botanicals, shorter shipping, and a supply chain that answers to Australian consumer law.
Red Flags Worth Avoiding
- Bright artificial colourants. They stain tubs, can irritate skin, and add nothing therapeutic.
- Glitter and "shimmer". Usually plastic, usually ends up in waterways.
- Vague claims with no ingredients to back them. "Detoxifying" and "healing" mean nothing if the bag is 95 per cent table salt.
- Prices that look too good. Magnesium salts have a real cost. A 1kg bag for six dollars is telling you what is inside it.
Ignore the bag price and calculate the cost per bath. A $49.95 pouch that delivers 15 to 20 baths costs $2.50 to $3.30 per soak. A cheap $12 bag that needs half the bag per bath to achieve any mineral concentration can easily cost more, and does less.
How Much Should You Use?
Concentration is where most people go wrong. A tablespoon of salts in a full tub is a gesture, not a treatment. For a standard Australian bathtub of roughly 150 litres, you want at least two to three generous scoops of a magnesium-rich blend, dissolved in water around 38 to 40 degrees, for a minimum of twenty minutes. Our guide to the onsen bathing ritual covers the full method.
"The question is not what a bag of bath salts costs. It is what a bath that actually works is worth."
Where Miyomi Sits
We built Miyomi to be the product we could not find here: a Japanese-style mineral blend made in Australia, with magnesium salts doing the real work and yuzu and green tea doing what a thousand years of Japanese bathing culture says they do. No colourants, no synthetic fragrance, no padding. One pouch, 15 to 20 proper baths.
If that sounds like what you have been looking for, join the waitlist. And whichever salts you choose, choose them with the label open.