Product review (5 stars): Perfect replacement for RPWFE if done correctly
The RPWFE filter is just a money grab.  you can use these filters to save yourself hundreds of dollars by doing the following.

1:  From an existing RPWFE filter remove the RFID and place it in the filter container over the RFID reader.
2:  Insert the Pure Green RPWF water filter with the proper sticker showing the month it was inserted
3:  You will see that it says "Expired".  Don't worry about it.  Its just reading the old RFID, it will work just fine.

You will definitely need to run about 2 gallons of water through the filter as every one I've used has carbon sediment it needs to wash out.  but after that it works wonderfully.