What is the specification?

Correct me if I am wrong. I think Delcol water filter has the active carbon in its system. I am referring to the outdoor POE unit.

Carbon is used to remove chlorine, smell and taste.
Manganese Greensand is used to reduce iron level which causes rust smell and yellowish colour in tap water.
Zeolite is used to reduce the hardness of the water.
You should not remove the chlorine from the main if you have a storage tank in the house. This is because the tank stores water for many days and it is going to become paradise for bacterial without chlorine.
You should install  the chlorine filter right before the water comes out from the water tap in the kitchen.