I haven't tried diamotaceous earth, many swear by it.
The Ask Dr. Sutter has a lot of info regarding Liver Flushing and parasite killing. I have read through their information and it is very helpful.
Especially the info regarding L-Ornithine which has helped many through the process of killing worms as in it it brings calmness to the body and allows you to sleep when you are being poisoned with ammonia die off.
I also like the coke flush now which uses no epsoms. This is the flush Doc Sutter recommends. He took a high amount of herbs, like 3-4 x's as much as recommended and with the L-Ornithine and flushing got rid so of some nasty deadly bugs he picked up in Nam.
There is no way in he&% I could take that many herbs, but it clearly depends on the person and how much they are flushing, I imagine. He flushed every night for 60 days. He is still in practice I believe, and might be a good fellow to talk to.