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What cause anodized aluminum windows to pit

I have anodized aluminum windows that are pitting . What causes this can they be fixed ? Or should I replace . The windows are 26 years old ,could it just be age . I would like to know the technical cause of aluminum pitting .

Ty Garner
General Contractor - Sun City, Ca.
July 6, 2009

First of two simultaneous responses -- July 7, 2009

Very probably someone used a cleaner on the windows that reduced some of the anodizing and allowed time and the elements to attack the frame.
Poor quality aluminum, bad extrusion process and bad anodizing are other options.
There is virtually no way to know what the primary cause was on old windows.
Sell them new high efficiency ones to help reduce their horrible electricity bills.

James Watts
- Navarre, Florida

Second of two simultaneous responses --

? Salt in the air ?

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

July 7, 2009

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