Particle size created by our home-made bottle is around 2.00 micrometers (MMAD) tested by cascade impactor but may escalate to 4.3 micrometers if tested at DV(50) by Malvern Spraytec. There may be a 2 micrometers difference in the particle size tested by different measurement method. Compared to most bottles in the market, our proprietary bottle ensures more efficient and effective performance.