Product review (1 stars): Useless
Have been using this in my refrigerator for the past year. After reading some reviews I was concerned that it does not do much. I have purchased two water quality testers (to make sure one is not faulty in its measurements)  to see how much good does this filter actually do. At first I tested tap water which was 275-280 PPM. Then I tested poland spring (as a control) out of a sealed bottle , and got 30-35 on both testers. Then I tested filtered water from my fridge with RPWFE installed. To my surprise the readings were 245-250PPM ! I thought that may be the filter was old\malfunctioning, etc. I ran out to the local big chain home store and got a brand new sealed GE RPWFE. I installed in and drained 3 gallons of water. Remeasured everything again. Similar results:
Tap water between 270-280 on multiple measurements
Poland bottled water 28-35 on multiple measurements
Fridge water with RPWFE installed 240-250 on multiple measurements
Question is for nearly $50 every 6 months is it worth installing this if PPM only falls by about 20-30 ?
A decent RO filter is $200, I am planning to go with that now that I found out how useless this thing is.