Product review (4 stars): Do the Trick and Save
These actually out performed the appliance-branded model and at 30% the price.  Using a Total Dissolved Solids (TDS) tester, I was able to verify these continued to filter effectively for a longer period of time; very upsetting when an OEM part underforms a third-party or cheaper vendors.  Do your own testing.  TDS testers are cheap and do the trick for us residential folks.  They saved me lots of money here...js