Fiber product versus de

[ChuckD]

Just wondering why it's better than DE?
[edit: yes, I see why that's a stupid question since poolman1 spelled it out already. But the rest of my post stands]

Also I know DE is a naturally occuring substance and harmless if I just dump it off into the lawn and I can't imagine my water being clearer.

What's this fiber made of? And is it (could it possibly be) cheaper than DE?

C.