Parasites, particularly protozoa are difficult to eradicate so this product may not eradicate them. It does look interesting though and I don't doubt the effectiveness against bacteria/yeast etc. One of the big problems is that protozoa have multiple stages in which one of them is the oocyst stage in which they are cocooned in the oocyst which protects them, unless the oocyst stage can be rid of then they will continue to proliferate :( . You might want to look at my post on the chitinase, chitinase helps to erode the protective coats made of chitin.