I purchased a Nasaka Aqua RO Model no 606 almost 2 months ago. Today, I am very happy and satisfied with the product. I feel its worth the money paid.It also matches the quality of bottled water , what company show in advt, I had a very good experience with "Okaya Group" .I purchased the unit from ABSOLUTE ELECTRICAL PVT LTD, HYD He tested our drinking water before suggesting this unit to us, not only that he also tested and showed us quality of drinking water we get from this product.I should not for get to mention the technical who came to fix the unit from the company was also very polite and professional in his work. I am very happy with the product and would recommenced all my friends to go for Nasaka Aqua RO Model no 606 water purifiers .so my dear readers if you want RO go through only NASAKA AQUA.