The simple answer is yes - you need to take of pressure treated wood. I have built several decks up in NJ with pressure treated wood and you still need to take care of the wood. There is a special weather treated coating to apply to protect the wood.
They should have informed you of this when they put the pergola up.
Z
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Jacksonville, Florida
Andover, New Jersey
The Villages
Second star to the right, then straight on 'til morning.
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