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While waiting for the replacement filter sent by Lunt to arrive, I tried the cleaning option mentioned by Star Catcher. It seemed to work quite well, so I didn't bother fitting the replacement when it arrived.
Now some 6 months after the episode I noticed the same fogging reappearing on the old filter. I note it was only where the filter was exposed to the ambient air, I.e. It was not evident around the edge that it was hel in by.
Others who have tried the cleaning option may care to review if they experience the same reappearance of fog.
Needless to say, I've replaced mine with the new one sent by Lunt, but I will still monitor the performance.
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