I just got my Pol filter in and had a question to ask any of you. On my Hoya 55mm Pitch:0.75 Cir. , in the case it has a Alert message that sayz... UV Alert ! (UVA:320nm-380nm) !! (UVB:280nm-320nm) What does this mean? Also, can I just keep my UV filter on when using a polorized filter? I'll be testing it at the beach tomorrow. Thanks you for any help.