After adjusting values, it does not change anything. I tried to do 500 on path tiles and it does not remove polution any further than vanilla. So concrete, bricks dont consume pollution at all

Just wanted to chime in here and say that, as of today, this mod works just fine. In a new game that is. I set it to a ridiculous high value for path tiles, used the console to spawn 10.000 pollution and it was gone in seconds. Replaced path tiles with grass tiles (you can do this in /editor quickly) and did another /c game.player.surface.pollute(game.player.position, 10000) and it was spreading much faster and getting deleted much slower by the grass tiles than it did the path tiles.

You can check for yourself in just a minute by using the commands as shown above.

Yes it definitely takes time to see the absorption. If still it does not work, please let me know!