Water quality supplied by HMWSSB in Kondapur Hyderabad

Dear Team,

I am confused about which purifier I need to use at my home. I have Aquaguard RO purifier installed in my home, currently after purification the TDS level is below 10 which is not suitable for drinking. I am planning buy gravity based filter but has doubts whether the water supplied by HMWSSB is under BIS standards and does not have chemicals such as arsenic, nitrates and pesticides and harmful chemicals. If the water supplied by HMWSSB is good quality and can be used for drinking after purifying with KENT GOLD+ garavity based filter I would like to go for it, as this water will have essential minerals in it and good for health. Please suggest. mail id: srinipodili@gmail.com