I seriously wonder if we ever get completely free of worms. How do we know every last egg was killed, much less every last bug. That's why I do ongoing maintainence, personally.
Plain ol' Vitacost tincture of Wormwood worked for me. I did 1 or 2 droppers full. (Probably 1 is best to start, definitely.) I don't think there is any researched amount on any of the otc products, just trial & error & learn what is right for you. However 1 tbsp each of p & b seems a popular amount.
Just one day's use may not do much good, but then you don't want to overdo it either. Again, trial and error.
Some people use activated charcoal instead of or with psyllium. It also gobbles up mercury & other harmful chemicals, like Bentonite clay.