New bath tub with shower -- water flows off back ledge to the floor

We just renovated a bathroom replacing the cast iron tub and surround with acrylic tub with tile surround. Now when we take a shower -- with good shower curtain coverage -- water spills to the floor. The back ledge of the tub is not level -- it has a high point in the middle such that when water hits it the water flows towards the floor. What are my options? I think I have seen plastic thingy's that are glued to either side of the ledge to divert the water from flowing to the floor. I suppose I could get a glass door system installed, but don't really want to go there.