Documents & Evidence
The basis for everything we claim
Certificates, reference records, catalogues and the limits of our scope — in one place. The purpose is simple: when you read a claim of ours and ask "what is that based on?", you should not have to go looking for the answer.
We also write down what we do not publish. A figure without a basis does not go on this site, and if we do not do a job we do not say that we do.
Management system certificates
All three from an independent certification body, with certificate number and validity date. The PDFs open directly — no form, no registration.
ISO 9001:2015
Quality Management System
- Certificate no
- MTS-45753
- Valid until
- 22.07.2027
- Body
- SIGMACERT DOO
ISO 14001:2015
Environmental Management System
- Certificate no
- MTS-45754
- Valid until
- 22.07.2027
- Body
- SIGMACERT DOO
ISO 45001:2018
Occupational Health & Safety
- Certificate no
- MTS-51641
- Valid until
- 15.07.2027
- Body
- SIGMACERT DOO
The certification body SIGMACERT DOO is IAS accredited (accreditation no MSCB-136).
Our references in figures
These are not marketing numbers: they come from the official reference list our proposals department sends to companies on request.
Each listed with contract year and location.
69 of them in the ISO 500 list of Türkiye's largest industrial enterprises.
Written up with the process flow and the treatment stages used.
From the field and the workshop
The equipment and plant images on this site are not stock photography: they are our own manufacturing and our own sites. We use no AI-generated images of plants or people. Where an image illustrates a process by animation, it is labelled "animation". Images of customer sites are published only with permission.
Go to the equipment pagesCatalogues and technical publication
Direct download; no form, no registration.
What we do not do
This is the hardest part of an evidence page. A company that never says where its scope ends looks capable of everything, takes on the wrong project, and the cost lands on the customer.
We do not do NOx abatement
In gas treatment we do acid and alkaline scrubbing, odour control and biofiltration. Nitrogen oxide reduction (SCR/SNCR) is outside our scope.
We do not manufacture WESP
We do not produce wet electrostatic precipitators. When one is needed, we say so at the start of the project.
Our rule for publishing figures
- ·We do not publish any unverified GESU figure.
- ·Where we give a range from the literature, the note "typical value, not a commitment" is mandatory.
- ·When citing a regulatory limit we state the source; we do not write a table number we cannot verify.
- ·A customer's name and site data are published only with their permission.
Looking for a document that is not here?
Reference contact details are shared at the quotation stage, with the relevant customer's approval. If you cannot find the document you need, write to us — if we have it, we will send it.
GESU Water Treatment · Bursa, Türkiye · +90 224 483 59 39 · info@gesu.com.tr