Product review (5 stars): Good Filter
My wife and I have been using these filters for years and found them very effective.  My only complaint has to do with the automatic cut valve in the main unit.  After replacing the filter a few times the valve becomes clogged and slows down the water flow.  What I have done is carefully remove the valve from the unit placing my own cut off up stream.  This has been very successful and we now have full flow every time we replace the filter.