## "Sofiyska Voda" AD treats the raw water from the dam with chlorine for disinfection and reduction of the risk of development of bacteria on its sites.

In wastewater treatment the **coagulant ferric chloride is used**.

Its role is related to phosphorus removal in wastewater, as it is mostly used in the winter months. In order for the coagulation to be effective, the active substance **ferric chloride** in the flocculant must range **between 38 and 42%**.

Our laboratory controls the input product in the purification process by performing analyses to determine its percentage content.



 

 

 



**The Laboratory Testing Complex (LTC)** to Sofiyska Voda is a high-tech laboratory having a team of experienced and highly qualified specialists and offering a wide range of environmental analyses. The laboratory of Sofiyska Voda has been accredited under the latest version of the standard **BDS EN ISO/IEC 17025** and owns a certificate issued by the Bulgarian Accreditation Service.



 

 

 

 

 

 



 

 

 





 

 

[LEARN MORE](https://sofiyskavoda.bg/en/services/laboratory-services)

 

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#### Over **100** participations in international proficiency tests (within and out of the accreditation scope)

#### Over **90%** successful results

#### Reliability and validity

#### Independent evaluation of the high competence