I have not noticed any difference between this filter and the much cheaper blue GAC (Granulated Activated Carbon) filter I have used in the past. I was hoping that this filter would help improve the filtration of solid minerals in my water using a sequence of three filter systems. My system is filtering a very hard and ferrous well water system. I have to change the filters every 3 months so I'm not sure if this filter is economical enough to use again. I've only been using it for a month, I'll update the review after 3 months of use. If it lasts more than 3 months and more than a year, then it's worth buying. In the current form, a change every three months is too expensive.
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