Influence of mould release agent on efflorescence of concrete with different type of cement is presented in this paper. This article is focus on primary efflorescence, specifically lime based, which cannot be completely avoided. Measurement involves not only qualitative and quantitative efflorescence test but also determination of chemical composition of leaching salt crystals. These properties were tested depending on the selected separators and used cement. From the results obtained follows that the different kind of separators as well as type of cements have impact on the concrete surface properties.