What you are experiencing is not unusual. It's normal to get a brownish/yellowish mess when you're doing the conversion. Like the previous poster, I have a sand filter, so I just replaced my sand after the conversion. Not sure if you will need to replace the screen or any of the "innards" of your DE filter or not...?

Basically, you started by doing the right thing: shocking the pool with several pounds of cal hypo. You need to keep doing the same thing, either with cal hypo or with plain old bleach. Bring up your FC level to about 10-15ppm and try to keep it there. Baquacil eats up chlorine during the conversion, so you'll need to add it for the several days of your conversion process.

With a sand filter, you have to backwash once or twice a day during the conversion. With a DE filter, since they filter much smaller particles than a sand filter, you might have to clean your filter as much as 4-5 times a day, I'm guessing.

Don't give up! Freedom from Baquacrap is just around the corner. Just keep adding cal hypo (or bleach) and keep your FC level at 10-15 ppm for the next several days, and keep backwashing your filter.

Your pool will go from yucky brown/yellow to lighter yellow to a sort of clear mountain dew color to crystal clear. And it ~should~ only take 3-4 days unless you had super-high levels of Bacqucil when you started.

Good luck, post if you have any ??