I personally use Canon's UV Haze Filter and Hoya's digital circular PL filter. PL filters work great with reflections and they make the colors more lively. There are also programs like Nik color efex that offer you to use filters as PP, but I think that they make some noise in the photo. Anyway, I used them now to show how the effect could be with the PL filter. Some noise occured as usual, and I tried to clean them in Corel Paint shop pro's digital camera noise removal tool.During this process the PL filter effect on the water lost some quality.
- applied Polarizing filter of Nik.
-applied Skylight filter of Nik
-added some contrast
Hope you like the result.