Water hardness in Mereni
18.9 °dH very hard
Tap water in Mereni is very hard: 18.9 °dH (337 mg/L · 19.7 gpg · 33.7 °fH).
Source: RAJA S.A. Constanța, Indicatori fizico-chimici ai apei potabile (OG 7/2023), valori medii 2026 (2026) · data checked 2026-10-29
RAJA S.A. Constanța lists Mereni in its 2026 table of average values (Ordonanța 7/2023) at 18.9 °dH. The table gives one value for the locality. Descale kettles and water heaters regularly.
Romanian operators report "duritate totală" in German degrees (grade germane); the minimum is 5 °dH.
Water data
| Total hardness | 18.9 °dH |
|---|---|
| Utility | RAJA S.A. Constanța |
How Mereni compares
- Tap water in Mereni is 16 % harder than the median of the 115 cities we track in Romania (16.3 °dH).
- By hardness it ranks 26 of 115 in Romania (1 = hardest); 77 % of these cities have softer water.
- Nearest city with clearly softer water: Comana, 15 km away (14.7 °dH).
- Nearest city with clearly harder water: Satu Nou, 29 km away (29.4 °dH).
Ranking of the hardest and softest water in Romania →
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 Mereni
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 19 °dH |
| AEG / Electrolux | 5 |
| Beko | 5th |
| 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 Mereni water hard or soft?
It is very hard: 337 mg/L as CaCO₃ (19.7 gpg, 18.9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Mereni safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Romanian operators report "duritate totală" in German degrees (grade germane); the minimum is 5 °dH.
How many grains per gallon is Mereni water?
19.7 gpg, equal to 18.9 °dH, 33.7 °fH or 337 mg/L calcium carbonate.
What dishwasher salt setting should I use in Mereni?
For 337 mg/L (18.9 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Mereni?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: RAJA S.A. Constanța, Indicatori fizico-chimici ai apei potabile (OG 7/2023), valori medii 2026 (2026). Method: figure published by the water supplier. RAJA S.A. Constanța, Indicatori fizico-chimici ai apei potabile (OG 7/2023), valori medii 2026 · Outdated figure? Tell us