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Dan Espen Dan Espen is offline
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Default Aluminum Pool Screen Enclosure

writes:

Our aluminum screen enclosure was built in 1998 under Miami-Dade
Hurricane Codes. It was built using 6063 alloy alluminum. In the
past year we noted a strange discoloration beginning to cover the
frame. It started as small greenish oxidation in a circular pattern
and now covers almost 70% (my estimation) of the enclosure.


Green indicates it's alive.
No oxide of aluminum would be green.

Clean with bleach solution.