A new approaches for water supply can disconnect the high quality and safety of drinking water from the water demand capacity. Portable water demand is actually only about 50% of the domestic demand, while toilets flushing comprises 30–40% of the in-house water demand.
Reduction the domestic water demand by 30% can resolve most of the urban sector dilemmas and enables long term planning and development. Sources for toilets flushing are integral part of each building. The options include: greywater recycling, roof rainwater harvesting and utilization of ultra low flash toilets.
Greywater recycling is a sustainable solution that balances the domestic water budget from its own water resources. The shower, bath, washing basin and washing-machine sewage are called greywater, and may be treated on-site and reused safely for toilet flushing and gardening. Recycle options for private homes and apartment buildings are available, and the economy of scale enables economic saving in large recycling systems.
Private homes can easily supply their toilet demand by rain harvesting. Even in the Middle East climate, a 100 square meter roof can supply half of the year flashing water, without installation of huge storage tank.
Other option to reduce the water demand is installation of innovative toilets that utilization less water for flushing. The ultra low water toilets can save up to 85% of the flushing demand.
Water arc is developing solutions for the urban sector and will recommend the appropriate alternatives for each urban customer.