Originally Posted by joecaption
Pressure treated wood does not get along well with paint and just not going to stay stuck to it.
Is your deck pressure treated by the way? Not sure how someone jumped to that conclusion. And if it is unpainted or unstained, you probably do not want to leave it that way.
Actually primer and paint will stick just fine to aged pressure treated wood.
Something like Sherwin Williams Woodscapes (not Deckscapes) solid acrylic stain is a better approach than primer/paint for railings and things in most cases though but not for horizontal surfaces under foot traffic.
As mentioned, although there are solid stains and porch and patio paints, even those claiming to be are not great choices for exposed deck surfaces. A semi-transparent or semi-solid stain is your best option for exposed deck boards.
Now then, I think you should clean and prep the deck properly. Rinsing it off with a hose is not going to do the trick.