The paper presents an overview of 30 years of experience in researching and implementing constructed wetland wastewater treatment plants (CW WWTPs) in Poland. Based on research conducted between 1995 and 2024, the results of pollutant removal efficiency and reliability in single-stage and hybrid constructed wetland systems (CWs) were compared. Problems related to the operation of such facilities were also presented. The experience gained indicated that single-stage CWs can be used on a larger scale in rural areas with scattered development. Hybrid CWs with vertical and horizontal flow, on the other hand, can be recommended for use in recreational centers or protected areas, especially in national parks, because in these systems, high pollutant removal efficiency and reliability is obtained. It was shown that the use of hybrid CW WWTPs is consistent with the idea of sustainable development. Recently, these systems have been referred to as Nature-Based Solutions that help mitigate the effects of climate change.