If there are amoebas in your drinking water, “digestive juices” are not going to save you.
This story says otherwise.
“N. fowleri only seems capable of reaching the brain if it’s given a big boost by being squirted deep into a person’s nasal passages. That’s why water that is considered safe to drink or bathe in isn’t necessarily safe to use in a neti pot, Yoder said.”
There are some organism that survive the purification process but are acceptable due to the fact that they pose no risk when water is consumed properly.
Snorting up into the deep sinuses is not proper consumption of water.
The organisms thrive in that environment because it is not the same as the gastrointestinal track.
What do you get out of repeatedly having your ignorance demonstrated on a public forum?