[nelsonminar]

Could you please tell if there is any way to filter magnesium citrate from a water solution.

I am an engineer myself who is tinkering which chemistry on this side.

Thanks for reading.

[Arkcon]

As stated, its just not possible.  Filtering, that is using a fine sieve, won't work for dissolved ions.  There are other methods, ion exchange resins, selective precipitation, distillation, or just buying some fresh water.