My water purifier was not working called service center and the technician attended. there is a need to change the filter cartridges and it will cost around Rs.4400/-. before purchasing particularly I had checked with sales guy about the maintenance cost per year he said it will be around Rs 1000/- to change the filter. and again to cross verify I called the same sales guy posing as a new customer and checked about the maintenance cost and his answer was same .they charged me heavily for servicing my water purifier