Acquguard water purifier — Candle Replacement

Dear Sir,

I have purchased Acquaguard water purifier for Rs.8, 500. I don't know the model but it will give ultimately the mineral water..
One the executive from your company has comein for normal checkup and told us to replace the candle.. I was shocked to hear that atleast for one year we have to change the candle for the same.. I don't know why we have to change for one year.. It was not told to us when we purchased..

I wanted to know whether we have to change the candle for every one year.. In this amount we can purchase new steel purifier every year..

Let me know about it asap.

Regards,

Vinay L