Design: safety material and it can be cleaned at high temperatures.
Easy to use: a single press on the valve. When you want to stop the flow, 
just release the valve. 
Usage: 
If you use the YT-300 (300ml) model, pour a 2.7g pack of nasal cleansing salt into the water bottle, then add warm water to the 300 ml mark.
If you are using the YT-500 (500ml) model, pour a pack of 4.5g of nasal cleansing salt into the water bottle, then add warm water to the 500ml mark.