Product review (4 stars): Really like this system
I bought one of these filters for work since I keep a hotpot at my desk and the water in our bldg. is really awful.  The filter itself lasts pretty long -- I ended up using mine for like 9 months before it just slowed down so much I had to toss it.  I am guessing these replacements will be fine, but it may be years before I need to order again and they will probably be out of business or something by then (my luck).  Love that this system is small and super portable.  Since I am only filling a regular hotpot like every couple days for hot tea and instant coffee, this is the system for me.