If we try to separate sand from sandy water through a filter paper then the solid particles are separated but - Chemistry - Atoms and Molecules

Question

If we try to separate sand from sandy water through a filter paper
then the solid particles are separated but the colour of the water
doesn't change to neutral Why?

Dazy · Accepted Answer

It is because some impurities still remains in the water

If we try to separate sand from sandy water through a filter paper then the solid particles are separated but the colour of the water doesn't change to neutral. Why?