@heisenberg34 Thank you, Dr. Heisenberg! You have more scientific curiosity than most of the doctors I've seen! I'm still doing a basic manual rinse but am happy with a nasal wash bottle I like better than NeilMed and even my little neti pot. It's called Maoever Nasal 300.
https://www.amazon.com/dp/B07HQ91761
The nasal tip is U-shaped, which seems more efficient than NM's vertical wash. Not insignificantly, the materials are food-grade, BPA-free. NM doesn't specify that. $9.99 on Amazon. I use one tsp. salt-baking soda mix that I keep in a jar, so no need to spend on refill packets. At some point, I may purchase their battery-operated unit for $69.99. This brand is Chinese, no surprise. I find it hilarious that...is the company really named after Mao?????