Water profile

銀泉（ラジウム泉）Ginsen (Radium spring)

ラRadon

A simple radon spring of Arima's silver-water (ginsen) tradition. The wellhead is cold at 18.2 °C, neutral pH 7.35, colorless and transparent, tasteless and odorless. Radon registers at a high 1,900 Bq/kg (about 140 mache units), placing it firmly in the radon-hormesis family; the source is reheated for bathing.

Good for

Aches & joints

Warmth eases stiffness and raises the pain threshold. Radon and sulfate springs show the strongest evidence for joint and muscle pain.

stiff shoulders

On the certificate:神経痛Muscle painJoint painFrozen shoulderMotor paralysisJoint stiffnessBruisesSprains

Recovery

Warmth and buoyancy lower stress markers and improve sleep; habitual bathing is linked to lower rates of depression.

fatigue, stress

On the certificate:ConvalescenceFatigue recoveryGeneral health improvement

Take care

Contraindications

急性疾患（特に熱のある場合）
Active tuberculosis
Malignant tumor
重い心臓病
妊娠中
その他一般に病勢進行中の疾患
（高温浴禁忌症（42℃以上））動脈硬化症、高血圧症

Measured at the source

7.35

Neutral

Source temperature

18.2°C

Cold mineral

Tonicity

Hypotonic

Flow rate

83L/min

Typical

Radon

1900Bq/kg

High

On the certificate

Chronic digestive disorders
Hemorrhoids
Cold sensitivity
（42℃を超えての浴用の場合）動脈硬化症、高血圧症
Gout
Chronic digestive disorders
慢性胆嚢炎
胆石症
Diabetes

Evidence

有明2号（玉泉・赤湯）Ariake No. 2 (Tamasen / Akayu)

塩Chloride

Among Japan's hottest natural sources at 94.8 °C, this is Arima's celebrated kinsen (gold-water) lineage — an iron-bearing sodium chloride strong-salt spring, hypertonic and neutral. Dissolved solids exceed 56 g/kg, far above ocean salinity, and the iron oxidizes on contact with air to leave the brown sediment that gives the bath its akayu (red water) name. Strongly salty with a pronounced metallic edge, and the salt layer it leaves on the skin is thick and warming.

Good for

Warming

Salt forms a film on the skin that slows heat loss, so the warmth lingers long after the bath (the classic heat-keeping water, nettō 熱の湯).

cold sensitivity

On the certificate:Cold sensitivity

Aches & joints

Warmth eases stiffness and raises the pain threshold. Radon and sulfate springs show the strongest evidence for joint and muscle pain.

stiff shoulders

On the certificate:神経痛Muscle painJoint painFrozen shoulderMotor paralysisJoint stiffnessBruisesSprains

Cuts

Mineral-rich chloride, sulfate and sulfur waters have a long-recorded soothing effect on minor cuts and slow-healing skin.

minor wounds

On the certificate:やけど