It is normal when your water purifier starts making dysfunctional noises and there is nothing to be worried about. Here are the common causes of such vibrations.
These vibrations could be caused by the difference in pressure between the different filters. There’s no damage induced by these vibrations and generally fade away in 3-4 days.
There can also be air bubbles that have accumulated inside the unit or Check Valve. Release the water from the spigot (the tap connected to the filter) and the air bubbles will be forced to flow out.
If the noise continues to come after a few days, there can be air in your main water source. The current Check Valve is disturbing your water pressure in the pipes, which is creating the noise.
In case of severe issues, make sure you get it checked by a technician instead of trying to fix it yourself.