Product review (5 stars): This is a fantastic bargain!
This product appears to be identical to the OEM filter but at a significantly lower price. The OEM filter at a national home improvement chain goes for $49.95 EACH.  The Waterdrop filter costs $8.00 Each! (A package of 3 for $24.00)  Installation was simple and the water flow rate seems to have improved as compared to the filter I replaced - but the old filter was about a year (or two?) overdue for replacement.  It's only been installed for two days but so far I am very impressed.