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Fuji Speedway Hotel - The Unbound Collection by Hyatt

富士スピードウェイホテルふじスピードウェイホテル

Other
Chubu·Shizuoka

Bathing & Water

Indoor BathYes

Enclosed indoor bathing area

Water treatment

Treated and recirculated(partial disclosure)
from Article 18 disclosure
  • Added water
    Yes
  • Reheated
    Not disclosed
  • Recirculated
    Yes
  • Disinfected
    Yes
    二酸化塩素系滅菌材
  • Bath additives
    Not disclosed

富士大窓神温泉

Fuji Omagami Onsen
塩
Chloride
+ Sulfate
Color
colorless and clear
Taste
slightly salty
Odor
nearly odorless, with gas evolution; undetectable 8 hours after sampling

Sodium Chloride-Sulfate spring

High silica
Composition fingerprint5.6 g/kg dissolved · Hypotonic
Na⁺57
Cl⁻78
SO₄²⁻26
◀ CationsAnions ▶
Sodium Na⁺
salt's cation — pairs with chloride to make the water salty.
Chloride Cl⁻
table-salt anion — coats the skin and holds heat in.
Known good for
  • Warmingcold sensitivity
  • Circulationtired legs
  • Aches & jointsstiff shoulders

A sodium-calcium chloride-sulfate spring with a sulfate sub-type adding quiet body. At pH 8.8 the water is alkaline, soft on the skin, and sits at the gentle end of Japan's 'beauty-water' tradition. Moderately mineralized at 5,640 mg/kg dissolved solids with notable metasilicic acid, it leaves a smooth feel after bathing.

Sampled at wellhead·Analyzed May 21, 2020·公益財団法人 中央温泉研究所·Cert no. 第14號登地第1号

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Onsen Oni

Last updated October 7, 2026