Yes, it is possible to take wudhu with such a slow water flow. There is no doubt that many of us are so used to letting the tap flow profusely without giving a second thought to how much water we are wasting.
“Do not waste water… Even if you are taking [ablution] from a big running river”
— Prophet Muhammad (PBUH) via Abu Dawood & Ibn Majah
Some people may still not be convinced that a small water flow will be enough. I say that’s just psychological and an over-reliance of having more than less. I personally found that cupping your hands together to collect the water before performing each wudhu action would create a water flow that is just as sufficient when cleansing each body part.
It may take a few seconds more than usual, but it’s so worth it because you’ll be saving bucket-loads before you know it.
NB: No water was wasted when taking this photograph.