It’s hard to find pressure treated wood at the moment, for a better deck and a little more money you can have practically the best deck.
Right now a 12′ decking board cost $13 if you can find it.
A 12′ trex enhance basics decking board only cost $21
And there is the option of galvanised steel framing that I can get for almost the same price as treated lumber.
It is galvanised to a g90 thickness, rated for beach front and the expected life span is 100 to 150 years.
Here is a deck that has the trex and the steel framing.
By the time you have your deck pressure washed and stained, you could have had this deck to start with.