Interview questions for an essay

Hello,

I'm Iris Kwon, a freshman at New York University. This semester, I'm writing an essay on water contamination in India, and I have been searching for people that can provide insight into potential solutions. If you would be okay with answering a couple of questions for me, I'd appreciate it so much. 

There have been plants known to remove heavy metals such as arsenic or lead from water. Would it be probable to purify India's contaminated water with plants on a country level? Would it be possible for India's water to be drinkable once the level of heavy metals in water decreases? What would be the main pushback with this method other than financing? 

It is a broad/general question, I'd appreciate any sort of insight or ideas from you. 

Thank you for your time,

Iris