// Definition
A dry sift technique using two screens stacked with a gap between them: a 60 LPI (250µ) work screen on top where material is agitated, and a 90 LPI (180µ) collection screen below that catches falling trichome heads while filtering out larger contaminant. The gap between screens is essential — it prevents the two meshes from interfering with each other and allows trichome heads to fall freely before being filtered by the second screen.
// From the Episode
The two-screen trick was shared in Episode 2 as a practical technique for improving dry sift quality at home. The principle is straightforward: the top screen allows trichome heads and some contaminant to fall through, while the bottom screen catches the heads but allows even finer dust to pass. The gap between screens is critical — if the screens touch, material gets trapped between them rather than falling cleanly. The LPI selection matters: 60 LPI (250µ) is open enough to let full-sized capitate-stalked trichome heads through, while 90 LPI (180µ) is fine enough to catch them while letting through only the smallest particles. This is the same principle that Bubble Bags use with their stacked micron sizes, applied to dry sift.
// Source
Ep. 002 Hash Church Episode II →