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Kusatsu Hot Springs were known as a resort for centuries, becoming popular for its health benefits in the late 19th century by Erwin von Baelz, a German doctor who taught medicine at Tokyo University and co-founded modern western medicine in Japan.
Blessed with the highest volumes of mineral rich waters in Japan, Kusatsu Onsen (Japanese word for hot springs) provides 13 public baths including free baths for local residents. One of Japan’s most acidic hot springs, Kusatsu Onsen kills almost all bacteria and microorganisms and has superior antibacterial power.
Located 120 miles northwest of Tokyo, Kusatsu is a small town nestled in mountains with great natural vistas and features. A hotel, restaurant and other amenities provide services for travelers.
Mineral Content of Kusastsu Hot Springs (milligrams per liter)
- Sodium (Na) 96 Works with potassium in regulating fluid exchange in an out of cells. Sodium leads to proper water balance throughout the body.
- Potassium (K) 25.2 Helps balance out the negative effects of salt in the body, which can help lower blood pressure and reduce the risk of heart disease.
- Calcium (Ca) 50.7 Calcium is essential for muscle function and helps strengthen bones. Also enhances blood circulation and relaxation.
- Magnesium (Mg) 49.1 Helps maintain proper blood volume, blood pressure and pH of body’s fluid system.
- Iron (Fe) .54.6 Alleviates symptoms of anemia, an iron deficiency.
- Aluminum (Al) 8.4 Small amounts of aluminum are considered a natural part of a healthy diet, growing in foods and other plants.
- Chloride (Cl) 126 Helps maintain proper blood volume, blood pressure and pH of body’s fluid system.
- Sulphate (SO4) 721 Reduces stress and increases production of endorphins, promotes sleep and stimulates immune system.
- Silicate (SiO2) 88.2 Naturally detoxes and softens rough or dry skin. Helps persisting skin conditions like psoriasis, acne and eczema.
- Hydrogen Sulphide (H2S) 98.6 Anti-inflammatory benefits.
These concentrates enable you to enjoy the same healthful and relaxing water immersion experience as sitting in Kusatsu Hot Springs.
This 8 lb jug of Kusatsu Hot Springs mineral concentrates provides concentrates for hot tubs up to 727 gallons capacity. If your hot tub’s water capacity is more than 727 gallons, you have the option of purchasing more concentrate.
To calculate the exact amount of Kusatsu Hot Springs concentrates for your size of hot tub, multiply the number of gallons in your hot tub by .011 lbs per gallon (the percentage of minerals in Kusatsu Hot Springs). This total will be the exact number of pounds of concentrate you need to put in your hot tub to replicate the Kusatsu Hot Springs water immersion experience. This box includes an 8 ounce measuring cup for this purpose.
After you have measured out the correct amount of concentrate (as per formula above) for your hot tub, make sure the temperature of the water is above 85 degrees so that the concentrates will dissolve (and stay dissolved) in your water. Once you have inserted the concentrates in your hot tub, your pool pump will evenly circulate the hot spring minerals. To sanitize the water, keep doing what you normally do including adding chorine or other chemicals you use.
Please note that WelSprings Hot Pools concentrates do not get trapped by your hot tub filter as these concentrates are in solution.
Temperature of pools: 100 F to 114 F
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Example of a hot tub with
the Blue Lagoon Hot Spring