Matsuyama New Grand Hotel

Day Use

Yes

15:00–00:00

last entry at 23:00

¥1,000

2 hours for ¥1000 (¥500 for children). LINE members pay ¥800

Bathing & Water

Indoor BathYes

Enclosed indoor bathing area

SaunaYes

Dry heat sauna room

Sauna is in the men's bath only; the women's bath description lists no sauna.

Cold BathYes

Cold water plunge bath, typically used after sauna

Cold-water bath (mizuburo) is in the men's bath only; not listed for the women's bath.

OnsenYes

Uses natural hot spring water

Capabilities

Room OnsenNo

Private onsen bath in guest rooms, for overnight guests only

Mixed BathingNo

Shared bathing area for all genders

Policies & Services

TattooNo

Allows entry with visible tattoos

KidsYes

Welcomes children and families

Discounted day-use rate stated for elementary-school age and under, implying children are welcome.

DiningYes

Restaurant or dining open to visitors (not just hotel meal plans)

1F restaurant/cafe RAF LOUNGE (opened 2026-05-30); a local news blog describes it as casually usable by anyone (meet-ups, breaks, after-work), not stated as guests-only on the official site itself.

WashingYes

Shower, wash stations, soap and shampoo provided

TowelsYes

Towels available to rent or borrow

Rest AreaYes

Relaxation space for after bathing

Chill-out chairs in the bath area for post-sauna rest; the 1F lounge/cafe RAF LOUNGE also functions as a rest space during the day per a local blog.

ParkingYes

On-site or nearby parking available

No on-site hotel parking; guests use affiliated nearby paid parking lots (e.g. Nankai Parking next door).

Water treatment

Treated and recirculated

from Article 18 disclosure

Added water
No
Reheated
Yes
Recirculated
Yes
Disinfected
Yes
塩素系薬剤
Bath additives
No

グランド温泉

Grand Onsen

Operated by · 松山ニューグランドホテル

湯

Simple

Sodium Chloride-Bicarbonate spring

High silica

Composition fingerprint0.4 g/kg dissolved · Hypotonic

Na⁺97

Cl⁻42

HCO₃⁻34

F⁻19

◀ 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

Smooth skindry, rough skin
Recoveryfatigue, stress

Grand Onsen is an alkaline simple thermal spring (pH 8.9) — sodium-led and light in mineral content, sitting squarely in Japan's beauty-water family thanks to its alkalinity and silica. Total dissolved solids are modest at about 415 mg/kg, yet a generous 60.8 mg/kg of metasilicic acid leaves the kind of thin silica film that makes skin feel noticeably smoother afterwards. The poster lists it for cold sensitivity, peripheral circulation disorders and fatigue recovery among the standard bathing indications. Because the source emerges at only 34.3 °C, the large bath is reheated, recirculated through a filtration unit, and chlorine-disinfected to meet the city's public-bath hygiene standards.

Sampled at wellhead·Analyzed Feb 20, 2025·愛媛県立衛生環境研究所

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