It's pressure treated? I'd do some reading on stain vs sealant, and solid colors vs transparent products. My parents keep on using solid color deck stain and while it looks good for that summer it all flakes off in the winter and gets stained itself from leaves in the fall... Its essentially paint IMO and I can't be bothered with sanding and pressure washing and reapplying "stain" every couple years, so I used western red cedar and leave it as is and it turns grey. I did apply transparent Thompsons water seal which did bead up the water for a year or two when the deck was a couple years old and its not really visually noticeable, but that was 10-12 years ago and I've done nothing since and all but a couple boards are fine. Next deck I might try clear thompsons water sealer from the start and reapply every couple years.