The complete guide
Mesh size vs blockage risk — Cyrank Gutter Guards Downpipe
A finer mesh keeps out more debris but also silts up faster with fine grit and moss spores, needing an occasional brush-off; a coarser guard like the Cyrank Gutter Guards Downpipe lets more water through unimpeded but won't stop small seed pods or pine needles. Match the guard to what actually falls on your roof rather than buying the finest mesh available by default.