looking for some feedback on iron filters. we have some serious hard water up here in my neck of the woods. i had a iron filter installed 5yrs ago . it is a greensand type . the largest one that was availible. It worked very well, but ive had to have it maintanced the last three years. the first time i had the plumber out to look at it he couldnt believe how clogged the valves were with iron deposits. anyway long story short he tested the water and suggested i replace the filter and go with a chemical treatment type of filter. ive been researching different iron treatment options and came across an article about Calmedia GSR plus. It sounds like an upgrade to what i have,but is it an affordable option? How long will it last and how will it affect the taste of my water?