Board Thread:Mod Discussion/@comment-6941549-20140119124249/@comment-6881629-20150622182208

The effect 0008CAC9 is used by the Potion of Waterwalking and Ahzidal's Boots of Waterwalking, player.removespell is the command to remove anything that would appear in the magic menu (spells blessing diseases effects etc).

If the command didn't remove the effect it probably means the mod maker didn't use the water walking effect that was already in the game. so you have to find out the id for it and replace 0008CAC9 with that one.