Asaya Hotel

鬼怒川温泉 あさやきぬがわおんせん あさや

Lodging
Kanto·Tochigi

Water treatment

from Article 18 disclosure
  • Added water
    Not disclosed
  • Reheated
    Yes
  • Recirculated
    Not disclosed
  • Disinfected
    Yes
    塩素系薬剤
  • Bath additives
    No

あさや源泉(子宝の湯)

Asaya Spring (Kodakara-no-yu)

Operated by · 株式会社あさやホテル

Sampled at wellhead
Simple
Classification

Sodium Sulfate-Chloride spring

Asaya's "Kodakara-no-yu" wellhead is a simple alkaline thermal spring (hypotonic, alkaline, normal-temperature class). Both the on-site pH 8.8 and the laboratory pH 8.77 sit well into alkaline territory, giving the characteristic slippery, skin-smoothing feel of Japan's "beauty-water" family. The water is lightly mineralized — 0.304 g/kg dissolved solids and 0.311 g/kg evaporation residue — which keeps the bath gentle, with little of the assertive mineral edge of stronger chemistries. Colorless, tasteless, and odorless at the spout, it presents as a soft, unobtrusive single-thermal source whose appeal lies in the alkaline silk-water feel rather than in pronounced ions or aroma.

pH
8.80
Alkaline
Source temperature
37.1°C
Warm
Tonicity
0.30g/kg
Hypotonic
Color
colorless and transparent
Taste
tasteless
Odor
odorless
Highlights
  • Top-decile alkaline

Analyzed Jul 8, 2022·一般社団法人 栃木県薬剤師会·Cert no. 第14感第1号

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GreyChertZ

1 year ago

Well, looks like I've finally grown enough to write a review. Huge Hotel Asaya, with an "American-style system" where everything is available inside the hotel but for a fee. There are rooms with their own rotenburo. 3 different onsen areas — on the roof, on the 1st floor of one building, and on B1 of another building. Let me start with what I didn't like. On the roof (13th floor) it's beautiful of course, but the water... it really smells like chlorine. For me it was literally unbearable. Everything costs extra, even playing pool. I don't like that. Something unusual for me — this is a really family-friendly onsen. The baths have accessories for kids: seats, little boats, that sort of thing. The onsens on the lower floors are better. No smell, there's a rotenburo with a small window. I liked that each onsen area has a common room where you can hang out before heading back to your room. The water is clear but has an effect on the skin — oily. For families this is definitely a top choice. But as a seasoned onsen veteran, it's just meh. Nice views though.