[Resolved]  hindustan pureit — Unable to purify

Intially I used candle filter. I purchased a pureit three months back. Normally the water supply from local municipality is fresh & clear. So I got clear water from pureit. The difference could not be understood. Last week I changed the accessories of pureit and simultaneously got some dirty water from municipality.
Surprisingly, I found that the product is unable to clear that water, which is done by local candle filter. I made complain, one representative came to me suugested to add some liquid.
My complain-
1) In respect of clearance of dirt pureit is less useful than candle filter which against the declaration by the company.
2) Why shall I add extra chemical which is not declared by the company and not tested where I don't had to add any chemical in candle filter.