Disc filtration solutions can filter at the range of which micron values?

• A. 10-100 microns
• B. 20-400 microns
• C. 1-5 microns
• D. 75 microns

Answer: (B)

Disc filtration works by passing water through a stack of discs with defined pore openings. Particles larger than those openings are trapped, and debris can be removed by backflushing to keep flow steady. For irrigation, these filters are designed as pre-filters to protect drip emitters from common debris like sand and silt. The typical usable range of pore sizes in disc filters spans from about 20 microns on the finer end up to around 400 microns on the coarser end. This range covers most everyday irrigation water contaminants without making the filtration too restrictive or too coarse, which helps prevent emitter clogging while keeping maintenance practical. Finer filtration (well below 20 microns) usually requires other filter types, while much coarser filtration wouldn’t remove enough debris to protect the system. Therefore, 20–400 microns best matches the capabilities of disc filtration.