How can people say tap water tastes as good as filtered water?

I did an experiment. I put some tap water in the fridge, and some filtered water in the fridge (from one of those faucet filter thingys). I drank both on a hot day. The tap water tasted like chlorine pool water. The filtered water tasted good. Now that I have stopped drinking tap water, the chlorine taste just jumps out at me. Why is the chlorine taste not obvious to most people?

Tagged as: chlorine pool, chlorine taste, faucet, filtered water, fridge, hot day, pool water, Tap water