I bought Nasaka purifier 7-8 months back, and what I am happy about is the aftersales service of our reviewers recommend us. Earlier I was using aquaguard, but servicing was a big tension. I am happy that I dont face any such problem with Nasaka. Also I didnt even need to call the servicing engineer. He came on his own for regular check up. Which was a BIG problem earlier. I am very happy with the product. I would recommend this product to everybody.