Arizona Buff White Chalk

We have a patio made of Arizona Buff. It's about 9 years old at this point. The person who made it said we should have it sealed after the "leaching" subsided. THe white stuff that looks like chalk. It never has.

What should I do? I feel like we should do something to protect it, but the articles out there on the web are contradictory.

Also - a part of our stone seems to be sinking. Any advice there?

Thank you!

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