Haven't read this whole thread, so apologies if someone already wrote this.

My mom taught me this over 35 years ago. No special pot or system needed. I just cup some salt water in my palm and snuffle it up through my sinuses.

It flushes stuff out...sometimes gross stuff that makes me glad it is out of my head.

Sometimes it just drains out the other side. Sometimes back into the throat where I swallow and let my digestive tract expel it.

Anyhow, I swear by this for head colds and sinus infections.