Which mains water filter?

[dan_the_plumber]

Hello everybody. I've been asked to fit a mains water filter, God knows why when we live in one the best quality water areas in the country but ours is not to reason why.

can anyone suggest a mains water filter that can be fitted under the kitchen sink without too much bother. I would ideally like to utilise the existing kitchen tap as opposed to one of those 'church hall, water heater' type taps.

thanks!