6. Why should I purge my device after each use? Customer Service February 25, 2020 15:23 Updated Follow We recommend that you purge your device after each use to remove products from the liquid hosing. Related articles 7. Do I need to hold the sprayer button to keep the sprayer on? 14. What is the correct PPE to wear while using the ByoPlanet® Electrostatic Spray System? 5. What does priming the sprayer mean? 11. Can I buy or use a longer extension cord? 10. What if I see residue build up in my liquid lines?