Firstly this is an unbranded water purifier which uses materials made in China. RO module is not original DOW but a Vintron.
Secondly the service personal cheat customers suggesting for RO filter even if it is not required for municipal water.
The service staff are not trained. They set the water to sweet, which removes all the necessary minerals from the tap water. The TDS level of the water is very less.
Best name to this brand is they are CHEATERS!