cistern

drain

tank

circle

storage

plant

pumping

flow

reuse

environment

pipe

pollution

drainage

garbage

pool

supply

manufactory

sewage

filter

treatment

sewer

ecology

sustainability

recycle

sanitation

clearing

sludge

cleaning

filtration

utility

wastewater

industry

liquid

reservoir

chemical

system

purification

factory

processing

water

distillery

facility

biomass

technology

dirty

waste