Nano-technology available for water softening (if any) & auto-mutiport valves for (India) domestic systems

(1) What is the current status of reliable nano-technology based systems available for water softening in particular and controlled water purification in market.

(2) What are some reliable, robust and easy-to-configure/set-up/use automatic multi-port valves available in Indian market for domestic ion-exchange based water softner systems ?