Old deck around IL pool

I have a large treated pine deck that wraps around a pool. 5-6 years ago I put down Cabots weatherproofing on the floor and white latex paint on the railings. We have been sanding the railings down but not for sure if I have to do anything to the floor. The deck is pretty old and gray, will be replacing some boards. We live in central IL and the deck is in full sun. The products that you have suggest are they available for purchase in our area?