Sewage originates primarily from domestic, commercial, and industrial sources. In many developed countries, these wastes typically are delivered either to on-site septic systems or to centralized sewage treatment facilities. In both methods, sewage is treated before being discharged, either underground (in the case of septic tanks) or to receiving surface-water bodies (in the case of sewage treatment plants), typically a stream, river, or coastal outlet.
From the time it takes the water from the WC or the tap to pass through the drain until it reaches the treatment plant can take up to 24 hours, which vary depending on the sewer system.
Wipes and other non-biodegradable items are made up of fibers of natural origin and synthetic fibers, which are what gives it that resistance. A wipe can take 30 days to biodegrade, although there are materials that will not disappear like polyester or polypropylene over years. Taking into account these details, wet wipes reach the sewer at almost the same condition as if they were brand new, because the agitation that occurs while down the sanitation network does not undo them, which slows down and destroys the normal functioning of sewage systems.