Talk:Corruption Prevention/@comment-174.69.78.27-20111212024959/@comment-4658608-20111213150121

Yes, holy water only works on the surface. But having the surface be hallow for 3 bricks more or less prevents corruption spawns on the surface, which should save your base if its a surface base. Generally speaking you don't need to worry about the corruption and hallow ratios, currently there's no event if either one of them reaches a certain point.

I just holy watered the surface about 3 screens in either direction from my base, and enough of the underground to have a hallow zone to farm souls of light - I didn't really need to though, there was enough hallow spawned naturally.