Particle size created by our homemade 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 methods. Compared to most bottles in the market, our proprietary bottle ensures more efficient and effective performance.