洞爺湖温泉
Toyako Onsen (blended source)Mixed source
塩
Chloride
+ Sulfate · Bicarbonate
- Color
- faintly yellow and clear
- Taste
- weakly salty
- Odor
- odorless
Sodium-Calcium Chloride spring
pH 6.8NeutralHot source · 51°CHigh silica
Composition fingerprint3.1 g/kg dissolved · Hypotonic
Na⁺68
Ca²⁺23
Cl⁻72
SO₄²⁻15
HCO₃⁻13
◀ 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
Toyako Onsen's blended supply — a mixing of wells 5, 6, 9, 12 and 13 together with the community wells 1, 2, 4, 5 and 6 and the KH-1 collector — is a sodium-led chloride spring with sulfate and bicarbonate layered in for a softer finish. The water arrives at the mixing tank at a warm 50.5 °C and neutral pH, carrying a faint yellow tint and a mild salty edge at the source. Moderately mineralized (about 3.1 g/kg dissolved solids) and generously stocked with metasilicic acid at 170.8 mg/kg, it leaves the kind of silica film on the skin that puts it squarely in the Japanese 'beauty-water' family.
Sampled at mixing tank·Analyzed Nov 7, 2023·北海道立衛生研究所
