Trigger pump sprayer having favorable particle size distribution with specified liquids

A trigger sprayer for use with a spray system, said trigger sprayer comprising:

• an articulable trigger,
• a pump operably connected to said trigger, whereby articulation of said trigger about a pivot from a forward rest position to a rearward dispensing position, under a peak force of 10 to 30 Newtons at 30 partial strokes per minute from said forward rest position to a position one-third of the distance towards said rearward dispensing position, said force being measured 40 mm from said pivot, whereby
• articulation of said trigger causes corresponding reciprocation of a piston in said pump, said reciprocation of said piston drawing liquid from a reservoir, said liquid having a surface tension of 20 to 75 mNewtons/meter, a kinematic viscosity of 8.7 E-4 to 0.0015 Pascal seconds at 25 degrees C., and a dynamic viscosity of 0.87 to 1.15 centipoises at 25 degrees C.,
• said liquid being discharged through a nozzle into particles;
• said particles comprising a volume ranging from 0.75 to 1.5 ml per full stroke of said trigger,
• said particles having a
• a Dv(50) particle size distribution of 100 to 150 microns, and/or
• a Dv(90) particle size distribution of 200 to 300 microns.