4. **Phytofiltration**

Phytofiltration technique is manly use to treat contaminated water. This technique involves, high metal-accumulating plants which function as biofilters, and it can be also effective in sequestering metals from polluted waters [24]. In this technique the polluteded water is either collected from a waste site or brought to the plants, or the plants are planted in the contaminated area, where the roots take up the waste water and the dissolved contaminants [25]. Many plant species naturally uptake heavy metals and other contaminant due to this it is a cost effective procedure for remediation.
