"Unfortunately, once parasites get a foothold in your body though, you're not getting rid of them with just fasting."
This is typical scaremongering and just wrong. Seriously, you're like in the lion's den saying that in here. :p
Just because fasting didn't work for you doesn't mean it won't for others. I would simply say to you that if you didn't get rid of your parasites through fasting you didn't do it for long enough. Then you went for a quick-fix method instead because you weren't able to do what was necessary to complete the cleaning out with fasting and/or keep your diet clean enough post fast. If that sounds harsh on your personal efforts so do your blanket statements in this Water Fasting support forum that fasting isn't good enough.