I use a Listerene bottle cap full per gallon of DW, about 1 to 11/2 ounces 
per gallon. When I used pure CS in my CPAP humidifier it left a grey gunk 
inside 
the humidifier. I have used 2 gallons of the mix and the humidifier looks 
clean. This is also my mouth cleaning amount. I use a capfull + 8 ounces of 
well 
water in my water pik, then swish a capfull for two minutes, twice a day.
Brickey