Its Very simple process but involves costly equipment (initial investment is higher but operating cost is extremly low).Sea water is nothing but brine solution in natural form.
I know of a company manufacturing such equipments and you can contact them in INDIA :at wape14@hotmail.com
regds
sskdr
Orange stains on your shower head:Its due to Iron present in water which may have Iron Bacteria in it.
Scaling amy be either due to presence of Complex Calsium and Magnesium salts.But My suggestin to you would be to get your water sample checked first and then install any kind of filter or...
What kind of chlorination process you are undertaking determines lot of issues based on ORP.I mean you have to state the chlorination process before I can suggest someting.