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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,904 companies indexed · Last updated: today
DirectoryCrafts & TradesBuilding installationWollerauKalk Ex AG
Kalk Ex AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Kalk Ex AG specializes in mechanical and chemical descaling and supplies descaling and limescale protection systems. Its services also include boiler descaling, boiler replacement and maintenance.

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Service area

Offering

Products & services

Industry:Building installation
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Kalk Ex AG

✓ Offered
6
Limescale removal systems
Limescale removal systems for single- to two-family homes, multi-family homes as well as industrial, catering and special facilities; installation, service and rental of Kalksoft systems.
Limescale protection systems
Limescale protection systems for single- to two-family homes, multi-family homes as well as industrial, catering and special facilities; Kalkfine systems to protect against limescale damage.
Chemical descalings
Chemical boiler descaling, heat exchanger, pipe and industrial/special facility descaling; including specialists, chemicals and general boiler inspection.
Boiler replacement
Boiler replacement for heat-pump boilers, combination boilers and electric boilers; flat-rate offers including working and travel time, inspection and installation of protective measures.
Active carbon filters
Active carbon filters for drinking water; remove contaminants, odour and taste substances as well as microplastics and heavy metals, with Aquapure units for different household sizes.
Water energising
Water energising with Aquavida for mains water; combinable with limescale protection systems, maintenance-free, with installation examples, advice and an offer.
Trust & reputation

ranQ Trust Score of Kalk Ex AG: 4.4 out of 5.0

Trust Score4.4/ 5.0

Very high

x

Data basis 96% · As of November 2026

Kalk Ex AG scores 89.1 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
x
CriterionValueWeight
  • Review quality: The average rating across all connected sources, smoothed against the industry mean. So 5.0 stars from three reviews do not outrank 4.7 from three hundred.82.624%
  • Review volume: The number of reviews across all sources. The scale is logarithmic: the first reviews count the most, and the maximum is reached at 50 reviews.100.010%
  • Review recency: The age of the most recent review. Two-year-old reviews deliberately sit in the middle, because that is normal for Swiss SMEs. Only after three years without a new voice does the value drop markedly.95.08%
Kalk Ex AG scores 85.5 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
x
CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.100.012%
  • Company size: The headcount band, researched by ranQ or stated by the company. It is scored in steps rather than by head count, because the data only provides bands.55.07%
Kalk Ex AG scores 86.7 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
x
CriterionValueWeight
  • Verification: Official register entry (commercial register with UID or professional-body record, 55 points), confirmed domain (20 points) and confirmed ranQ profile (up to 25 points, depending on completeness).86.722%
Kalk Ex AG scores 6.6 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
x
CriterionValueWeight
  • Website authority: Ahrefs' Domain Rating measures, on a scale of 0 to 100, how strongly a website is linked from other websites. For Swiss SMEs the range up to 40 is typical; the maximum is reached at 35.6.64%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Kalk Ex AG reaches a ranQ Trust Score of 4.4 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.7 out of 5 stars from 74 customer reviews. The data basis is 96%, so the score is backed by part of the criteria. As of November 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
4.7
of 5

Aggregated from 74 reviews across all connected sources

Sources
GGoogle4.774
★TrustpilotSoon
PProvenExpertSoon

Further sources are added continuously and factored into the ranQ Rating.

Knowledge

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Comparisons

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Location

Sihleggstrasse 23
8832 Wollerau
Opening hours
Mon
08:00 - 11:30, 13:30 - 17:00
Tue
08:00 - 11:30, 13:30 - 17:00
Wed
08:00 - 11:30, 13:30 - 17:00
Thu
08:00 - 11:30, 13:30 - 17:00
Fri
08:00 - 11:30, 13:30 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-105.641.201
Founded
2000 · 26 years
Last commercial register change
September 6, 2021
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • SZWollerau
Legal form: Graded by liability and disclosure. The weight is kept small: a sole proprietorship is not a dubious company, it is just liable differently.
100.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

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