I have applied grain effect like this project on my website. The homepage is perfectly fine like the project.
However as I went to apply the effect on another page with huge grid system, the grain effect seems to flicker badly (eye strain warning…) on the published site. Deleting the whole grid does solve the problem but I kind of need the grid to place my images. I believe the code in the settings is okay since the homepage (with grid too) is doing fine.