Holding tank connected to the sinks and shower, designed to hold waste water until it can be dumped into a septic system. Gray Water Waste water from the sinks and shower. See also Gray Tank GTW Gross Trailer Weight (GTW) is the same as Gross Vehicle Weight (GVW) when referring to a ...
Easy for greywater systems and compost toilets to do better than septic tanks, because there is virtually no blackwater (sewage containing human feces) water going into native soil, just lightly used sink, shower, or laundry drainwater; or in the case of compost toilet—urine...