Hi, anyone know what i can do with the horrible smell coming from the air intake of the tub? I took it apart last weekend and cleaned some hair out of it, but same thing. I can see some water laying in the pipe in the bottom - should it even be there? Can I pour something in there? It's an older Beachcomber tub. I don't know how the plumbing works. I had thoughts of pouring vinegar in there or baking soda , I know it could mess up my chemistry - but maybe I shouldn't put anything down there period.