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A foggy main tube is a common problem.

Sometimes this is the indication of a leak. If you notice fog appear suddenly or during a dive, it may be a good idea to surface and check for leaks.

Fog can be cured by placing a new desiccant pouch in the main tube about 12 hours before your dive.

Anti-fog chemicals can also help. These are available at any dive shop.

You can also use some gases which aren't contain water vapour. Nitrogen gas could be very useful for that operation.