Percolating

verb

1. To pass a liquid through a porous substance; to filter.
2. To drain or seep through a porous substance.

   "Water percolates through sand."

3. To make (coffee) in a percolator.

   "I'll percolate some coffee."

4. To spread slowly or gradually; to slowly become noticed or realised.

   "Reports on the pitiful state of many prisons have finally percolated through to the Home Office, which has promised to look into the situation."