We have removed all moss from our pavers on our patio;should we apply Moss Out on our patio to prevent it coming back? If so, when and how often tks

Seek out "Wet and Forget" at your local Lowes. It is a blue liquid that you apply with a pump sprayer. You mix 5 parts water to 1 part "w-n-f". The only prep is that the surface must be dry. I apply every 6 mos. The wind and rain are what activate it. It will kill moss between pavers as well.