Jeju City
South Korea · Asia
The water
21 mg/LSoft
Source: Jeju water samples in Hindawi RCT (PMC) · Published figure. Hardness counts dissolved calcium and magnesium in the water; it is the number your hair meets in the shower.
What soft water does to hair
Very little gets between your shampoo and your hair here: lather is easy, rinsing is clean and build-up barely features. Fine hair may go limp or flyaway, and heavy conditioning weighs it down faster.
The washing routine for Jeju City
Keep your normal rhythm; soft water asks for no detox routine. Go lighter on conditioner, which feels heavier in soft water, and if fine hair goes limp, reach for volume at the roots rather than more product through the lengths. A clarifying wash now and then is plenty.
Climate, from recent records (Open-Meteo, ERA5 2015-2024): August is the warmest month, averaging 30°C by day, and humidity peaks in July at about 87% on average. In the hot months, sun and sweat do as much damage as the water: shade, a hat and a rinse after swimming carry the routine. In the humid months, frizz is the main event; anti-humidity styling matters more than wash frequency.
Plugs and power for your tools
Sockets: Type C and F. Supply: 220 V, 60 Hz.
A 120 V only dryer or styler (North American) will burn out on this supply, and a plug adapter does not change voltage. Check the label for dual voltage (100-240 V) before you plug in.
Plug, voltage and frequency: IEC World Plugs and national standards.
Plan Jeju City properly
The trip planner turns this water profile into a wash plan for your hair type, a chosen kit and a packing list, month by month.