Why do I need a tap water filter for my home, since water treatment plants are supposed to filter our water?

We are living in the world of chemicals and every year1000's of chemicals get added to the list. Many of these are synthetic chemicals. Muncipal water treatment plants are built for long and they may not upgrade as and when new chemical is added. There are chemicals which highly dangerous to human health.

Water is conveyed in metal pipes and I myself never seen they are being replaced from my child hood. These old metal pipes will add Lead in to our water.

There are many reasons why we should have our own home filters - Not a simple water filters which can remove only suspended solids. But, a good RO (Reverse osmosis) filters must be used for filtering our water - which can remove dangerous chemicals including synthetic chemicals.

just open the folder and see the residue, and you will know why there is a filter

To purify water from impurities it gets from the water distribution metwork and to avoid any shortcomings which might exist in the treatment plants.

I believe that when choosing any kind of filters that are designed for water, it is best to use the2 stage whole house filters here https://filterway.com/whole-house-systems/1-stage-filtration-systems/ , maybe you should also consider stage2 or stage3, I don’t know your needs, choose what suits you best, I answered your question, then the choice is yours.