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I don't use desiccants or anti-fog solutions. I load the housing in an air conditioned area and float it in a bucket of water while I'm not diving... no fogging so far with this method. I did experience fogging once... when I loaded the housing on the boat (in a high humidity environment). If you're using the internal flash, or shooting RAW images... try to allow a little more time between shots for the heat generated inside the housing to dissipate, rather than build up. Good luck!bubble blower:I purchased some desiccant packs that Dee said she used (of course she uses an oly). 2 gram package I think. I won't fit in my canon wp-dc700 housing very well. What do you Canon users use?