building
clean
dirty
drop
effluent
environment
facility
filter
filtered
filtering
filtration
flow
icon
illustration
industrial
infographic
line
liquid
pipe
pipeline
piping
plant
plumbing
pollution
processing
pump
purification
purified
purity
recycle
recycling
sedimentation
sewage
sewer
sign
sludge
station
steel
strainer
supply
symbol
system
tank
tap
trap
treatment
waste
wastewater
water