Water hardness in Renai
248 mg/L very hard
Tap water in Renai is very hard: 248 mg/L (14.5 gpg · 13.9 °dH · 24.8 °fH).
Source: Taiwan Water Corporation open data (2026) · data checked 2026-10-20
Renai in Nantou County is served by Taiwan Water Corporation, and its 2026 open data reports 248 mg/L as CaCO3. That is very hard water by the scale used on this site. Scale build-up in heating elements and taps is the most likely household effect. The file does not say which source feeds the town, so we do not guess.
Taiwan Water Corporation reports total hardness in mg/L CaCO₃; the drinking-water standard is 300 mg/L.
Water data
| Total hardness | 248 mg/L |
|---|---|
| Utility | Taiwan Water Corporation |
How Renai compares
- Tap water in Renai is 97 % harder than the median of the 265 cities we track in Taiwan (126 mg/L).
- By hardness it ranks 6 of 265 in Taiwan (1 = hardest); 98 % of these cities have softer water.
- In Nantou County it is number 1 of 12 cities; the regional median is 160 mg/L.
- Nearest city with clearly softer water: Puli, 19 km away (70 mg/L).
Ranking of the hardest and softest water in Taiwan →
What it means at home
- Severe scale: heater elements and washing-machine heaters fail early.
- Detergent use is very high; taps and screens coat within days.
- Dishwasher at maximum salt setting.
- An ion-exchange softener is practically essential; RO for drinking water.
How much salt will you use for softening?
Yes. At this hardness a softener pays for itself through appliance life and detergent.
Descale a coffee machine or kettle about every 1 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Renai
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 14 °dH |
| AEG / Electrolux | 3 |
| Beko | 4th |
| Hoover | S2 |
| LG | H3 |
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 Renai water hard or soft?
It is very hard: 248 mg/L as CaCO₃ (14.5 gpg, 13.9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Renai 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 Renai water?
14.5 gpg, equal to 13.9 °dH, 24.8 °fH or 248 mg/L calcium carbonate.
What dishwasher salt setting should I use in Renai?
For 248 mg/L (13.9 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Renai?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Taiwan Water Corporation open data (2026). Method: figure published by the water supplier. Taiwan Water Corporation open data · Outdated figure? Tell us