Here are some FAQ's:
Problem: Cap is difficult to unscrew.
Possible Cause: Pressure still in bottle.
Solution: Remove 2" piece (2" piece unscrews from the on/off valve). Hold the unit upside down and while pointing away from people, animals, or other objects. Turn the on/off valve on to release a small amount of water and the remaining pressure.
Problem: Plugged nozzle or Unit is shooting a "stream" water.
Possible Cause: Debris in nozzle or bottle.
Solution: Tap the nozzle on a hard surface. Scratch surface of nozzle (near opening). Remove nozzle (see removal instructions) and soak overnight in vinegar or Misty Mate's® Nozzle Cleaner, following the instructions on the bottle.
Problem: Mist is not "fine".
Possible Cause: Unit is low on water. Unit is not properly pressurized.
Solution: Add water to top of tube. Pump unit 20 to 25 times. Ensure that each pump stroke is rapid and goes all the way down to the cap.
Problem: Unit will not pressurize.
Possible Cause: Unable to get a tight seal. Missing O-Ring(s) or monovalve.
Solution: Remove pump cylinder from pump assembly. Apply a small amount of petroleum jelly to the O-Ring located under the cap, and/or the plunger seal (monovalve) located at the bottom of the pump assembly. Replace O-Ring(s) or monovalve.