The Graytec Companies have developed a closed-loop circular greywater recycling system known as the Blue Circle System that collects greywater from showers, bathtubs, and bathroom sinks before cleaning it to potable quality, and then directly returning that purified water back into those same showers, bathtubs, and bathroom sinks for reuse.  The Graytec Companies have also created the Blue Eco System that redirects greywater for the purposes of toilet flushing, laundry, irrigation, and landscaping.