Product review (5 stars): will purchase again
Bought this as a replacement for Frigidaire PureSource RG-100.  So far so good.  Was easy to replace.  I soaked the filter for about 5 minutes prior to installing.  After installing I ran a bunch of water through waiting to see black, dark or discolored water as other reviewers had mentioned.  I never saw any dark or discolored water.  I will purchase this item again! :)