LSB,
If you are after blurred flowing water effects, I suggest a shutter speed of 1/15th or slower, depending on how smooth you want the water to appear. You should be able to adjust the aperture (to a high f number, though I note the S5500 can only go down to f8) and/or the ISO setting (to 64) to achieve the desired shutter speed and obtain the correct exposure. Try setting the ISO to its lowest value of 64 and then using shutter priority mode of 1/15th second or less to see if the correct exposure can be obtained.
It may be that in the lighting conditions you have, that f8 (the smallest aperture your camera can set) will still result in overexposure at this shutter/ISO combination. The simple answer would be to go back at a different time of day when there isn't so much light.
I certainly wouldn't go rushing out to buy a ND filter, and I'd say you get a much more pleasing effect from using a slow shutter rather than using photoshop.
I'd also say, it's essential to use a tripod for these slow shutter speeds.
Regards,
Duncan
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