Strengths

- High potential for the remediation of physics and organic pollutants [33] [49] [53] .

- low running cost,

- easy maintenance,

- no secondary pollution,

- CW can tolerate fluctuations in flow,

- sustainably facilitate water recycling and reuse,

- Provide favorable habitat for many wetlands organism [47] .

Weakness

- Require a large area.

- have low hydraulic load and

- exhibit intolerance to heavy pollutant loading rate [33] ,

- Seasonal death and plant diseases

- Seasonal variation of the treatment efficiency

Threats

- Continuous input of pollutants can cause an exceedance of the wetland and reduce the system’s ability to perform treatment efficiently.

Opportunities

- Use of CW for river treatment is a recent development, therefore, there is yet no consensus on the optimal design of wetland systems, and not much information on their long-term performance.

- Need to reinforce the choice of plants species,

- Resolve the problem of saturation,

- Optimize the treatment to reduce the large area required.