So it's been 45min and no matter how hard I try I cannot unscrew the last filter. The first 2 filters were a pain in the @$$ to unscrew, but have been done. Now this last 1 I have been on for a good 30min doing everything I can think of.
It's a 5-stage unit from FilterDirect and all lines have been disconnected.
The plastic wrench it came with (that barely helped get the others off) broke; because (yes), it's on that tight. Also if you're wondering, the wrench was at the very top.
I have also used the hammer-tapping method to help release pressure, and it hasn't budged.
I would really like not to destroy this unit so any insightful feedback would be wonderful.