Water hardness in Ruisui
85 mg/L moderately hard
Tap water in Ruisui is moderately hard: 85 mg/L (5 gpg · 4.8 °dH · 8.5 °fH).
Source: Taiwan Water Corporation open data (2026) · data checked 2026-10-21
Ruisui in Hualien County is reported at 85.0 mg/L as CaCO3 by Taiwan Water Corporation in its 2026 open data. That is moderate hardness. Scale should be light. The file does not describe the source water for the town, so we say nothing about it.
Taiwan Water Corporation reports total hardness in mg/L CaCO₃; the drinking-water standard is 300 mg/L.
Water data
| Total hardness | 85 mg/L |
|---|---|
| Utility | Taiwan Water Corporation |
How Ruisui compares
- Tap water in Ruisui is 33 % softer than the median of the 265 cities we track in Taiwan (126 mg/L).
- By hardness it ranks 216 of 265 in Taiwan (1 = hardest); 19 % of these cities have softer water.
- In Hualien County it is number 5 of 7 cities; the regional median is 101 mg/L.
- Nearest city with clearly softer water: Fengbin, 18 km away (38 mg/L).
- Nearest city with clearly harder water: Shoufeng, 43 km away (122 mg/L).
Ranking of the hardest and softest water in Taiwan →
What it means at home
- Visible kettle scale every few weeks; vinegar or citric acid is enough.
- Water heater and washing machine: some long-term scale; a scale inhibitor slows it.
- Dishwasher: medium salt setting.
- Softener optional; pays off mainly with a gas boiler or tankless heater.
How much salt will you use for softening?
Optional. A scale inhibitor or a small softener protects the heater; soap savings are modest.
Descale a coffee machine or kettle about every 3 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Ruisui
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 5 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| Hoover | S1 |
| LG | H1 |
From each brand's manual for the model family named in the source; your model may differ, so check its manual. All brands and how to change the setting →
FAQ
Is Ruisui water hard or soft?
It is moderately hard: 85 mg/L as CaCO₃ (5 gpg, 4.8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Ruisui safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Taiwan Water Corporation reports total hardness in mg/L CaCO₃; the drinking-water standard is 300 mg/L.
How many grains per gallon is Ruisui water?
5 gpg, equal to 4.8 °dH, 8.5 °fH or 85 mg/L calcium carbonate.
What dishwasher salt setting should I use in Ruisui?
For 85 mg/L (4.8 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Ruisui?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Taiwan Water Corporation open data (2026). Method: figure published by the water supplier. Taiwan Water Corporation open data · Outdated figure? Tell us