Isazen Inn

Day Use

Yes

Capabilities

Mixed BathingYes

Shared bathing area for all genders

Water treatment

Pure source-flow

from Article 18 disclosure

Added water
No
Reheated
No
Recirculated
No
Disinfected
No
Bath additives
No

新井第2号泉・動力揚湯源泉、新井第5号泉・唐竹沢源泉混合泉

Arai Spring No.2 / Arai Spring No.5 (Karatakezawa) Blended Source

Operated by · 東鳴子源泉管理有限会社

Mixed source

Sampled at mixing tank

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Bicarbonate

+ Chloride

Classification

Sodium Bicarbonate-Chloride spring

A hot (64 degC) blended source combining Arai Spring No.2 with the Karatakezawa Spring (Arai No.5). The chemistry is a sodium bicarbonate-chloride water — bicarbonate-led with a salty layer underneath — weakly alkaline and soft on the skin, of the classic beauty-water family. Metasilicic acid runs to a generous 237 mg/kg, leaving the kind of fine silica film that makes skin feel noticeably smoother afterwards.

pH

8.20

Weakly alkaline

Source temperature

64.0°C

Hot

Tonicity

1.36g/kg

Hypotonic

Free CO₂

13mg/kg

Low