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How much water in humidifier?
#1
I us only distilled water in my humidifier and while it's cheap, I don't like to waste it. I also like to empty the water each day and use fresh every night.

So, here is my solution. I bought a small 6 oz measuring cup from the baked goods isle in the grocery store and measure the amount I need. Pouring from the gallon jug to the measuring cup and then to the humidifier is easier than straight to the humidifier. And the formula could not be easier. It's a 1 to 1 relationship. Humidifier set to 3, then 3 oz. humidifier set to 5, then 5 oz. This will be good for 8 hours on the hose.

Works for me.
CPAP is a journey like “The Wizard of Oz”. It’s a long slow journey. You will face many problems and pick up many friends along the way. Just because you reach the poppies, it doesn’t mean you are in Kansas. 
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#2
I use leftover water for my plants.
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#3
That correlation may hold under present conditions; but temp and ambient humidity will impact how much water will be used.
I'd rather not run a tank dry.

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#4
I still have plenty left over for changes, I just don't waste as much.
CPAP is a journey like “The Wizard of Oz”. It’s a long slow journey. You will face many problems and pick up many friends along the way. Just because you reach the poppies, it doesn’t mean you are in Kansas. 
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#5
Sounds complicated, I set mine at 4, top it off every night and wash it once a week.
I am not a Medical professional and I don't play one on the internet.
Started CPAP Therapy April 5, 2016
I'd Rather Be Sleeping
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#6
I watch the usage amount and put that much in for the next day + a tad more for good measure. Many nights the usage is only 25% of the total reservoir volume and I see no point in dumping 75% my distilled water for no good reason. I usually see about 1/4 inch of water left in the reservoir when I dump it. YMMV so adjust accordingly.

A side benefit of this method is that the warm up time is considerably reduced so that I'm getting humidified air much sooner than if I had to heat a larger quantity of water.

Dude
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