Product review (4 stars): Great filter. My experience is you can easily keep ...
Great filter.  My experience is you can easily keep it in service a year(Or slightly longer) if your tap water is not too bad.  Easy to install, no issues.  The ability to remove contaminants is well documented, and certified.  I wish the third party filters would do the same, as these filters are pricey......$40-$50.  Can sometimes get rebates, which makes it worthwhile.  One caution in leaving filter in too long, is it can clog and start to grow  stuff(guessing it is mildew)