Yukaisoukai spa (Yokohama)

 spa resort, bathhouse, onsen

www.yukaisoukai.com/tay/ (Japanese)

Several baths (all with jet or bubble bath equipment) and two saunas (with TV sets) inside, and a big rotemburo (one cool pool, one hot bubble pool, two individual cauldron baths, a "cave" bath (which makes it rather an inside bath then a rotemburo), a "water bunk" with warm water streaming under a resting person, and a resting scaffold in a pavillion make bathing truly pleasant and varied, entertaining, I may say.
The table of the water mineral content says that the water in the main bath contains, mg/kg: Na+(480), K+(20,5), Mg++(7,1), Ca++(7,6), Nh4(7,5), H2SiO3(62,8), HBO2(2,7), CO2(7,2), Cl-(88,00), HCO3-(1170,0), CO3--(22,8), Fe++(0,86), Al+++(0,15), SO4--(0,1), Zn++(0,06), Mn++(0,04), Sr++(0,06)

Naturally, there's also a massage room (outside the bathing facilities) and a restaurant, plus a barber's shop. In the lobby, there's a free of charge foot bath.

Working hours: 10:00 - 03:00

phone (Japanese only) 045-854-2641, 044-989-2644

Getting there: bus 72 from Ofuna sta. (bus stop is across the bridge from the station, near the entrance to Kannon temple on the hill) to Yukaisoukai stop (190 yen) or the Yukaisoukai spa shuttle bus from Hongodai station (Keihin-Tōhoku Line—Negishi Line)