Fiber Clear as DE Replacement

Anyone ever used Fiber Clear as a DE replacement? The previous owner had a bag of it they left. Most of the writing on the bag was marketing gimics, but the concept of using a small diameter and short fiber to add filtration is pretty sound. That is how HEPA filters work after all. I would imagine this stuff is way more expensive than DE, but it was free to me since I found in in the garage :)

I chucked some in my sand filter and it appears to help with the filtration, with out much of an impact on the admittingly poor accuracy of the pressure gauge.

Red