室戸海洋深層水 (Muroto Kaiyō Shinsō-sui)

Cape Muroto's continental-shelf bathymetry yields the most stable deep-sea water profile in Japan; 30+ year-old commercial extraction infrastructure.
Magnesium 1,200–1,400 mg/L; calcium 380–420 mg/L; Mg/Ca ratio ~3; nitrates and silica enriched vs surface water.
Premium mineral-water RTD, deep-sea-water cosmetic toners and serums, magnesium-fortified salt.
Deep ocean water sourced 300–600 m below the surface off Cape Muroto in Kōchi. Stable temperature, mineral balance (Mg-rich), and low bacterial load make it a high-grade ingredient for cosmetic moisturisers, mineral beverage, and salt production. Kōchi Prefecture's Muroto and Aki facilities are the largest commercial deep-sea-water sources in Japan; Toyama Bay and Okinawa Kume Island also produce. Branded retail mineral waters and cosmetic moisturising lines have built a multi-decade premium category around the Muroto label specifically.
| Japón | Food / cosmetic ingredient; mineral disclosure under JAS / cosmetics labelling |
|---|---|
| Unión Europea | Mineral water classification; CosIng listed (Sea Water / Maris Aqua) |
| Estados Unidos | GRAS for food / beverage use; MoCRA cosmetic use |
| China | GB 2760 food-additive register; verify import |