That stuff is produced by a guy named Jeffrey Brooks, of Beyond Biodiesel
. I agree that his results sound very promising, but his equipment is specialized and I don't believe I've ever seen anyone else reproduce his results.
In any case, by Jeffrey's own admission this is a very labor-intensive process (more labor than I feel like doing, anyway), and as others have pointed out, we have no assurance that various additives and contaminants have been removed. Just because you can see light through it doesn't necessarily mean it's good for your injectors.
Four wheels: '04 F-350 XL, 3.73 SRW, early 6.0, 5R110W, 342k -- sold. '04 Chevy Tahoe, 5.3, 4L60E, 88k (wife's).
Two wheels: '90 Kawasaki KX 250, '83 Kawasaki KX 80 bored to 125, '96 Yamaha PW 80
Past: '84 F-350 6.9, '86 F-250 6.9, '88 Bronco II 2.9, '91 Explorer 4.0, '94 F-250 7.3, '94 F-250 351w, '97 F-250 351w, '99 Escort 2.0