Sustainable design specialists have come up with a new concept that could revolutionise home water management and change the experience of going to the toilet forever.Sinks, showers, washing machines and toilets together use and discard large quantities of water, meaning that products such as Altera Design Studios new WashUp could prove a key facet of new eco-designs. Shifting the washing machine from its usual spot in kitchen or utility room, WashUp combines the appliance with the toilet in a bid to reuse the water running out of it for flushing.Eco enthusiasts are concerned that toilets use clean water where not strictly necessary, with the new product designed to recycle dirty washing machine water for toilet flushing.Placed above the toilet, the device is also claimed to help save space in a cluttered home, by mounting the device above the toilet and saving floor space.And its higher berth has also been hailed as relief for those suffering back pains when bending down to load the washing machine.