This Kenko Circular Polariser Filter allows you to remove unwanted reflections from non-metallic surfaces such as water, glass etc. 

Kenko Circular Polariser Filters also enable colours to become more saturated and appear clearer with better contrast. This effect is often used to increase the contrast and saturation in blue skies and white clouds. Kenko Circular Polariser Filters do not affect the overall colour balance of a shot.

Colour and contrast enhancement
Light rays which are reflected by any surface can become polarised so polarising filters are used to select which light rays enter your camera lens. Kenko CPL filters allow you to remove unwanted reflections from non-metallic surfaces such as water, glass etc. They also enable colours to become more saturated and appear clearer with better contrast. This effect is often used to increase the contrast and saturation in blue skies and white clouds. Kenko's polarising filters do not affect the overall colour balance of a shot.

Reduce Glare and Reflections
Using a Kenko Circular Polarising Filter, reflections and glare can be reduced significantly from non-metallic surfaces. A camera angle of 30 degrees from the reflecting surface (glass, water, etc.) is ideal for maximum effect.