subject process grey water is water that is mildly contaminated by non toxic pollutants such as small quantities of sand and mud and household waste such as left over food and vegetable cuttings water produced during the rinsing cycle of a washing machine is generally usable for recycling in the subject process but water produced during the washing cycle may not be particularly where clothes being washed are heavily soiled or contaminated by oil or lubricants unusable grey water is discarded by being flushed down a drain rinse water and relatively clean water produced during the washing cycle referred to below as grey water flows into a charging conduit 12 which extends from the washing machine to two tanks a first tank a and a second tank b valves 14 a 14 b at the inlets of the two tanks control the flow of grey water into the tanks valve 14 a is normally open while valve 14 b is normally closed upper and lower level switches 16 a 18 a are provided in tank a the upper level switch is activated when the level of grey water in the tank exceeds a preselected maximum value while the lower switch is activated when the level of grey water drops below a preselected minimum value similarly upper and lower level switches 16 b 18 b are provided in tank b grey water above the maximum level in the two tanks discharges to a drain through conduits 20 a b.