My sand filter just is not getting it, so before I change the sand, thought I would try adding some DE. After reading about it, I learned it is carcinogenic when inhaled - so I am a little fearful. My hubby has respirators that he uses with work, but what about when we back wash to an open area (field). Looks like it would dry out and become airborne again. So then I read about "fiber clear" a safe alternative. Anyone tried it. Since it looks like I may have to change the sand in my filter anyway, thought it would be a good time to try. Any comments?