code/game/objects/structures/shower.dm 
SHOWER_SPRAY_VOLUME | The volume of it's internal reagents the shower applies to everything it sprays. |
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SHOWER_EXPOSURE_MULTIPLIER | How much the volume of the shower's spay reagents are amplified by when it sprays something. |
Define Details
SHOWER_EXPOSURE_MULTIPLIER 
How much the volume of the shower's spay reagents are amplified by when it sprays something.
SHOWER_SPRAY_VOLUME 
The volume of it's internal reagents the shower applies to everything it sprays.