A Guide To Different Types Of Onsen Water

A man bathing in a traditional Japanese outdoor onsen

For centuries, bathing in onsens has been an important part of Japanese wellness culture.

Onsens are basically natural hot springs in Japan. The water is full of minerals, so it can be a little different than what you’re used to, but that’s part of the fun. Onsens are often found at traditional Japanese inns, and there’s a whole etiquette involved.

The good news? You don’t have to travel all the way to Japan to experience the magic of onsens. These natural thermal baths are gaining popularity worldwide, offering a taste of Japanese wellness closer to home.

But what exactly makes an onsen? Our blog explores some of the key ingredients that make an onsen, and we also discuss the different types of onsen waters.


Natural Hot Springs

Onsen water originates deep within the earth, geothermally heated by volcanic activity. This creates a naturally warm and mineral-rich bathing experience.

Communal Bathing

The communal aspect of an onsen fosters a sense of community and relaxation. You are all there for the same reason: to soak away stress and enjoy the moment. Sink into the steaming hot water, connect with other patrons, chat, and unwind after a long day. It’s a sense of camaraderie and a break from social pressures.

Health Benefits

Soaking in onsen water boasts a range of health benefits. The warm water does wonders for your stress levels, melting away tension and leaving you feeling calm. Plus, the heat improves your blood circulation, which means more oxygen gets delivered throughout your body, making you feel energized.

But that’s not all! The real magic lies in the mineral content of the onsen water. Different springs have different minerals, but some common ones include calcium, magnesium, and sulfur. These minerals are like tiny helpers for your body. They can help relieve aches and pains in your muscles and joints, kind of like a natural pain reliever. Some minerals also have detoxifying properties, helping your body get rid of impurities.

Now that you know what makes an onsen, let’s explore the different types of onsen water and how each can benefit your body.

Different Types Of Onsen Water

As we discussed before, what truly sets onsens apart is the diversity of mineral water found in each spring. Here’s a peek into some of the most common types and their unique benefits:

Alkaline Onsen

Rich in minerals like calcium and sodium bicarbonate, alkaline water is known for its silky texture and soothing effect on the skin. It also promotes relaxation and helps ease muscle tension.

Sulfuric Onsen

Sulfuric onsens are a powerhouse for pain relief and detoxification. The minerals in this water can help soothe muscle aches and joint pain and even improve skin conditions like eczema. Just be aware that the sulfur can give the water a distinct odor, but it quickly fades after leaving the onsen.

Saline Onsen

Feeling the chill? Saline onsens, with their high salt content, are fantastic for improving circulation and keeping you warm after a soak. They’re also known to be beneficial for muscle tension and general aches. Imagine stepping out of a saline onsen feeling warm, invigorated, and ready to take on the day.

While these are the most common ones, there are also other fascinating types of onsen waters to explore. For example, iron-rich onsens can boost energy levels, while carbonic acid onsens offer a gentle, effervescent experience that aids in circulation.

Let’s Relax: Your Onsen Escape in Thonglor, Bangkok

A woman bathing in Let’s Relax Spa and Onsen

Craving a taste of Japanese wellness without the flight? Let’s Relax Onsen and Spa in Thonglor, Bangkok, is the place to be. Our onsen spa, located in the busy Sukhumvit district, is tucked away in a quiet nook away from the noise and everyday hustle.

Our zen and minimal interiors are inspired by traditional onsens. Our lovely team will take their time to understand your pain points and recommend the right onsen or spa treatment for you. Indulge in a variety of experiences with us, such as:

Mineral Bathtubs

Immerse yourself in the therapeutic warmth of mineral-rich waters, replicating the benefits of natural onsens. Each bath offers a unique mineral composition.

Saunas and Steam Rooms

Amplify the detoxifying effects of your onsen experience with a session in the sauna or steam room. Let the heat gently remove impurities and leave you feeling refreshed.

Hot Stone Bed Baths

For deep muscle relaxation, unwind on a bed of heated stones. This ancient therapy melts away tension and promotes a state of complete serenity.

Cool Down Rooms

To balance your experience, Let’s Relax offers cool-down rooms where you can relax and rehydrate after your invigorating soak.

We have more to offer. Explore our extensive menu of massage and spa treatments to customize your wellness experience. Our expert team will be happy to guide you on what’s best for you – whether it’s a deep tissue massage, invigorating scrubs, or soothing aromatherapy, there’s something for everyone.

Ready To Relax And Rejuvenate?

Let’s Relax Onsen and Spa in Thonglor welcomes you to experience the magic of onsens for yourself.

Book your appointment with us today!

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