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CPAP Condensation

Water in CPAP Hose (Rain out)

CPAP Humidifers

How to prevent CPAP condensation?

In Brief

Causes of hose condensation
How to prevent hose condensation
Tips to prevent water in CPAP hose

Do you have water in CPAP hose or mask? To avoid hose condensation, also called CPAP rainout, you have to understand what are the causes of the problem.


Causes of CPAP condensation

In any comfort or industrial humidifcation system, the challenge is to prevent condensation. To control the condensation, there are things that you can control, such as:

  • the temperature of the air - your bedroom temperature in your case.
  • the amount of water added in the humidifcation system - CPAP humidifier in your case.

So, when the CPAP condensation occurs? The condensation appears at the dew point, which is the temperature at which the air can no longer hold all of its water vapor, and some of the water vapor must condense into liquid water.

Bottom line...If the duct is cold, we get condensation. Or, if the CPAP hose is cold, we get water in CPAP hose. Why is the CPAP hose cold? Because it may be cold in your bedroom, or because the temperature of the humid air from the hose is higher than the hose.


How to prevent CPAP rain out

To prevent the condensation, you have to avoid the dew point, which is always lower than (or equal to) the air temperature (bedroom temperature).

In our case, you may have to:

  • adjust the thermostat of the room up (increase the temperature of your bedroom),
  • prevent the hose from cooling too much:

Tips to prevent water in CPAP hose

Here are the most helpful tips:

  • just turn down the humidifier down a notch or two. Natural humidity in the home varies, so your humidifier needs can vary.

    But have you actually tried the cpap without the humidifier? I wouldn't assume you will have congestion without the humidifier until you will try.

  • Do you have your machine lower than the level that you sleep at?

    Move your CPAP back up to just below your mattress level and hang your hose above your head. Any moisture then has to run back down the hose to the humidifier rather than into your mask since more of the hose is running uphill than downhill.

    A CPAP hose lift can be very helpful in this case.

    If you you haven't tried that it might be worth you time to give it a shot!

    Note: You also need to be careful in case there is a build up of water in the 'u' bend of the hose as it will effect the airflow and may block it.

  • Make sure you note the FILL LINE on your humidification chamber. If you fill even a hair above the line, it gurgles and brings water in to the tubing and your mask. Generally, filling 3/4 of the water chamber should get you through the night. No wasted distilled water that way either.

    Remember - make sure when you add water, you do not go over the FILL LINE. Occasionally, if you go right up to the line or a tad bit over, you may get water in your mask.

  • Cover your tubing with insulated tubing cover - this will also greatly reduce or eliminate the "rain out" effect. Insulated CPAP Tubing Cover has a full length zipper, so its VERY easy to get on and off. Easy to machine wash and I even add a drop of bleach to keep it sparklin' white and sanitary.

    Also, a very cheap and simple way to insulate your hose is to cut the toes off tube socks and pile them on

  • If your sleeping environment is cool at night and you are getting "rain out" - try turning down the heat/temp setting on your machine.

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