What would be your recommendations for introducing non-conventional water treatment units in the spring fed gravity water supply systems in hill...

What would be your recommendations for introducing non-conventional water treatment units in the spring fed gravity water supply systems in hill...What would be your recommendations for introducing non-conventional water treatment units in the spring fed gravity water supply systems in hilly/himalayan terrain, as shown in the youtube link below?

I am asking this question with a view to know about the latest technologies and updates on small-scale water treatment units for rural water supply projects. The major water quality parameters of concern in the spring source water are calcium, turbidity (in rainy season) and bacterial contamination.

Your suggestions would be heartily welcomed.