The innovators: looped water system for Earth friendly shower
When he was working on an academic project with Nasa, Mehrdad Mahdjoubi, a Swedish industrial designer, realised there could be parallels between sustainability in space and on Earth. The extremes of space required that the vital resource of water be used in the most efficient way possible. Water should also be used like this in the home, he thought.Inspired by those experiences with the space agency, Mahdjoubi created a shower system that reuses the same water in a circular loop, while two filters take out impurities as it circulates.
This Shower of the Future , from his company, Orbital Systems, can operate on five litres of water. The water constantly circulates for 10 minutes or so – the time of an average shower – in turn saving also on energy.
“The reason that we make it work sustainably in space is because we have to do it,” the Swedish industrial designer said. “What if we try the same things on Earth … [if] the house was like a space capsule, how would we go about it? The most sustainable lifestyle is the one that we have in the most extreme environments and that may be in space or in a submarine where you actually have no choice but to really care for the resources that you have.”
Mahdjoubi said that while savings have been made in how water is used in toilets and washing machines, the same was not true of the shower. “Without changing the technology, we seem to just heat up water and put it down the drain,” he said. In Sweden, where the company is based, the average shower emits 15 litres of water a minute. During a 10-minute shower this amounts to 150 litres, he said.
The Orbital Systems shower starts with five litres of water and adds more if some is splashed out or is taken out of the system by the filters.
Water is first pumped through two filters, one which takes out larger particles such as sand, skin and dust and then a finer filter to extract bacteria, viruses and blood.
From there the water travels through a heater that moderates the temperature, which is set by a wheel control the user can change from hot to cold. The water then exits the shower nozzle as normal.
But when the water trickles through the drain it goes through a sensor which analyses it. If it is contaminated, the sensor recognises this and replaces the water.
The company says water flows at a rate of 20 litres a minute, compared to conventional showers, which typically range between seven and 12 litres a minute.
The shower takes in water from the mains until it senses that there is enough to go in a constant loop, said Mahdjoubi. “Even though the water is clean we would always flush it out before the next user. Comparing [it] to a hot tub where you sit in your own dirt for however many minutes, this is way more hygienic. When you stand in front of one of these showers you completely forget that the water is being recycled. It is the most unremarkable thing.”
The shower unit can be fitted as either an integrated system in the floor or as a standalone cabin with glass walls. The first units were delivered in December with most of the sales to commerical customers such as gyms, residential homes, swimming pools and the Swedish military. Nursing homes and hospitals have also bought them, said Mahdjoubi, because of the filter system.
“Not because they really want to save a lot of water but because you can guarantee that the water is clean and free from Legionnaires’ disease because it is always being filtered.”
How much money is saved depends on the cost of water and energy and how often the shower is used, he said. The company claims that a UK home can save £1,100 a year assuming there are four showers taken a day lasting nine minutes each.
Offsetting this is the price of the shower. The cheaper of the two residential units, where the shower is integrated into the floor of the bathroom, costs £3,300 while the standalone cabin costs £4,100.
As sales increase, Mahdjoubi said, the price would fall to less than £2,000 in three years. “I would say that we are steadily going down in price but we have to start where the market can afford it, that is why we have this premium and commercial focus we have right now,” he said.
A family would need to spend an average of about £110 every year replacing the purification capsules.
So far hundreds of the showers had been sold, said Mahdjoubi, and there had been particular interest from Denmark (location of one of the highest water prices in the EU) and from California, where there had been persistent droughts over recent years.CONTENTS
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