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Arsenic treated lumber is not being sold, but other pressure treated wood will be safe to use for your raised beds. Composite lumber and cedar lumber will both be safe and will last a long time for raised beds.
Water,
Older decks made from untreated lumber such as Douglas Fur last about 30 years. Pressure treated lumber last 50 years or longer. Redwood all heart grade or Clear Cedar can last longer than 50 years whereas the less costly knotty grades may last only 40. Hardwoods may last longer than 40 years. Man-made materials come with their own limited warranty which can range anywhere from 25 to 100 years
My husband and I built a deck last year. I would recommend using pre-treated lumber. It will last longer than ordinary wood. Also choose the best galvinized nails available to avoid rust.
My husband is a lumber grader and made 59,000 last year!
no: you can last forever under water
you dive under water
I would recommend buying the wood for your deck at Lowe's lumber yard. Make sure to purchase pre-treated wood. It will last longer and avoid having to hand treat the wood.
The new synthetics last the longest, however initial cost is much more expensive that treated lumber. If you are paying someone to build it, then in the long run it will be cheaper since it will not need replacing.
band-aid
They can only last 15 mins under water
Tables can be made from any kind of wood. Most tables in homes are made of hardwoods, as they are more durable and last longer. Picnic tables are made of cedar or redwood if they are not pressure treated lumber.