Why Is My CPAP Hose Still Wet?

Finding your CPAP hose damp or dripping ("rainout") is a common, practical issue — not a sign your machine is faulty.

Why it happens

If you use a humidifier, the air travelling through the tube is warm and moist. As that air cools — for example, in an air-conditioned room, or simply because the tube itself is at room temperature — the moisture in the air can condense on the inside of the tube, the same way condensation forms on a cold glass on a humid day.

Is it safe to keep using a hose with condensation in it?

A small amount of condensation isn't generally a safety issue on its own, but a hose that regularly collects standing water should be dried out and, if this happens often, addressed — persistent moisture sitting in tubing isn't good for hygiene over time (see our cleaning guide), and gurgling water in the tube can be startling or uncomfortable during the night.

How to reduce it

• Lower the humidifier setting slightly, especially in air-conditioned rooms.
• Use a hose cover, which adds some insulation — see how a hose cover helps.
• Consider heated tubing, which keeps the air temperature more consistent along the hose's length — see the CPAP hose, explained.
• Route the hose so it doesn't dip low between the machine and mask — a low point in the tube can collect water rather than letting it drain back.

If it doesn't improve

If you've tried adjusting the humidifier and the hose still regularly collects significant water, ask the CPAP Pakistan team whether heated tubing or a different humidifier setting would suit your setup — see CPAP accessories.