Which RO system should I go in for my home in Delhi? TDS is 700 - Which RO unit has a better after-sales service?

Hi friends,

I am living in Delhi and am looking for a RO system for my home. Currently the water is MCD + ground water mixed. It has TDS of 700. I have selected Hind. Lever's Marvella RO, Zero B's Prestine model, Kent Grand+ and Nasaka Minijet 12. Other than Nasaka, rest of 3 have got award from Water Digest for these RO systems.
Marvella is costing me Rs.12500/- from the Co. dealer and Prestine is for Rs.14200/-, Kent Grand + is for Rs.14000/-.

1. Please tell which should I go with and which of these has better service
2. Which will have less charges for changing parts or AMC in future.
3. Which of these has got any awards from any big Co.
4. Which of these is best value for money.
5. Any online best deals if you can suggest.

Thanks in advance.

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