When I went for my studies in my capital city, I purchased this kent optima(11016) 10 L water purifier for my own use and within 8 weeks of its uses the water was unabled to prossesed for furifying. as the water was unable to pass to the second layer and mostly the UF membrane stops functioning even after cleaning in regularly. the charcoal provided in in was not of good quality and it changes the tastes of water and also the design in which it is made creates a lot of problems while cleaning the containers of it. its servicer center is not acceseble easily so that one can go and check-it-out for its another parts. all these sorts of problems makes me so horrible that at last I just dumpt this stuff in one corner of my house. I will never reccomend for this product. 9