Don't know about the parasites. For internal I eat a lot of raw garlic
which clears out any parasites and has many other benefits as well.
I have a Neti pot for sinus irrigation and most of the time I use saline
solution (1 tsp of salt and 1/2 teaspoon of soda to a pint of warm water) along
with Tea Tree oil - I'm up to 9 drops but started with one. My sinuses
have been clearer this winter than ever in my life - I started the Neti pot in
early December.
I have only tried urine in the Neti pot once. I mixed it 1/2 urine and
1/2 saline solution. I found that combination somewhere on the
Internet. I didn't see any benefit greater than what I'd been having with
Tee Tree oil and the Tee Tree oil leaves a nice pleasant aroma for a long
time. It's also antiseptic, as is urine.