I suggest to all customer who plan to purchase to kent Ro, please understand the acual value of product of ro, uv, tds controller cost is around less side Rs 2000 but in kent u invest around 13000 rupees due to his tv ad, kent ro based type company only be fool to his customer by tv ads, any ro only depend on his normal filter whose costing is Rs 50 and membrane whose cost is Rs 400, if u want best quality water than change normal filter every 3 month and membrane after 1 year.