The arsenic has been replaced with copper in the new pressure treat. All the new pressure treat timbers are guaranteed for 40 years. (8x8, 6x6,4x4,4x6 etc) They are treated to a .40 retention and you can put it in the ground and it will last 40 years. All 2" dimension-2x4-2x12 is treated to a .25 retention and it will last 40 years with an above ground application only. All decking is teated to .15 retention and will last 40 years above ground with maintenance-putting a water repellent on it once a year. There is a newer pt in California more environmentally friendly, with the same warranty but only if used above ground. It is borax treated.
I personally would only use the composite deckings for my decks as someone said, it never needs to be treated and doesn't have splinters
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