Water hardness in Grosuplje
20.3 °dH very hard
Tap water in Grosuplje is very hard: 20.3 °dH (362 mg/L · 21.2 gpg · 36.2 °fH).
Source: JKP Grosuplje, Trdota vode po vodovodnih sistemih 2025 (2025) · data checked 2026-10-29
Slovenian suppliers report total hardness in °dH ("nemške stopinje").
Water data
| Total hardness | 20.3 °dH |
|---|---|
| Utility | JKP Grosuplje |
How Grosuplje compares
- Tap water in Grosuplje is 85 % harder than the median of the 15 cities we track in Slovenia (11 °dH).
- By hardness it ranks 1 of 15 in Slovenia (1 = hardest); 100 % of these cities have softer water.
- Nearest city with clearly softer water: Kočevje, 38 km away (10.4 °dH).
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 Grosuplje
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 20 °dH |
| AEG / Electrolux | 5 |
| Beko | 6th |
| Hoover | S3 |
| 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 Grosuplje water hard or soft?
It is very hard: 362 mg/L as CaCO₃ (21.2 gpg, 20.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Grosuplje safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Slovenian suppliers report total hardness in °dH ("nemške stopinje").
How many grains per gallon is Grosuplje water?
21.2 gpg, equal to 20.3 °dH, 36.2 °fH or 362 mg/L calcium carbonate.
What dishwasher salt setting should I use in Grosuplje?
For 362 mg/L (20.3 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Grosuplje?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: JKP Grosuplje, Trdota vode po vodovodnih sistemih 2025 (2025). Method: figure published by the water supplier. JKP Grosuplje, Trdota vode po vodovodnih sistemih 2025 · Outdated figure? Tell us