You need to replace the KDF Chlorine Filter annually under nornal use (2 people showering daily). The KDF Filter is not regenerated, it needs to be replaced annually or if you begin to smell chlorine. It has nothing to do with softening the water only removing the chlorine, sulfer, heavy metals, dirt & sediment.
It then pH balances the water. More.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.