To move or pass through some thing. No, it won't be too dark in here—a good amount of light will still filter through these sheer curtains.
filter through (something)
to pass or seep through something. The water filtered through the coffee grounds and dripped into the pot.The clear water filtered through and left the sand behind.
filter through
v.
To be allowed to pass through something or to find a way through something, especially an obstacle: The sunlight filtered through the thin curtains.