Greywater reuse is a sustainable practice that involves harvesting rainwater, and repurposing water to non-potable household use, such as toilet flushing, laundry water, and irrigation. It's really a simplified rainwater harvesting method which also eases pressure on stormwater infrastructure.
Where the water goes
The uses are the ones that never needed drinking quality water to begin with: toilet flushing, laundry water, and irrigation. That is the logic of the whole idea. A household treats every litre to the same standard, then spends a large share of it on jobs that would be perfectly well served by water that never needed treating at all. Matching the quality of the water to the job it is doing is what greywater reuse amounts to, and the reason it is worth doing is that so much ordinary household demand sits at the undemanding end of that scale.
Less pressure on freshwater sources
The benefits of greywater reuse extend beyond individual households to the wider environment and community. Greywater reuse reduces freshwater extraction from rivers and aquifers. Every litre reused on the property is a litre that does not have to be taken, treated and piped there in the first place. At one household that is a modest number. Across a street, a subdivision or a district those litres add up, which is why the practice draws interest from well beyond the individual owner, and why it increasingly appears in conversations about how new developments are supplied.
Less pressure on stormwater infrastructure
Greywater reuse also lessens the impact on stormwater infrastructure. Water held and used on the property is water that is not arriving in the network at the same moment as everybody else's. That is the same principle that sits underneath rainwater harvesting generally, which is why the two are so often discussed in the same breath. For anyone building where stormwater capacity is a live constraint on what can be consented and built, this is the benefit worth understanding first, because it speaks directly to the problem the network is trying to solve.
The wider environmental gains
Greywater systems can also lead to reduced energy use and chemical pollution from treatment, replenishment of groundwater, increased agricultural productivity, reclamation of nutrients, and improved quality of surface and ground water. That is a long list, and the thread running through all of it is simple enough: water reused close to where it is already sitting travels less, is treated less, and carries less with it when it eventually goes. Our sustainability page sets out where this fits into the wider picture at Promax.
What it saves the household
Greywater reuse can save up to 40% of water waste, making water available for outdoor use even in the face of restrictions, and reducing water bills. These benefits contribute to a more sustainable and cost-effective household water management system. The outdoor use point deserves more attention than it usually gets. Restrictions land hardest on the visible, discretionary end of water use: the garden, the wash, the things people actually notice losing. A household with its own reused supply carries on doing them when the mains supply is constrained.
Where Slimline tanks fit
Promax, a leader in water storage solutions, offers a range of products that support greywater systems, including the innovative Slimline tank range. These solutions are designed to provide efficient and eco-friendly options for water management. A slimline tank is, by shape, made to fit where a round tank will not, and on a tight site that is frequently the deciding factor rather than a detail. We cover that constraint properly in our guide to slimline tanks for new builds.
Built-in pump and changeover device
Promax Slimline Tanks are designed to seamlessly integrate with greywater systems, providing a reliable storage solution. They come equipped with a built-in pump and changeover device, ensuring a continuous supply. The changeover device is a crucial component that automatically and seamlessly switches from tank water to mains water when the tank is empty, offering convenience and efficiency. That is what makes the system liveable for an ordinary household: the supply never stops, and nobody has to think about which source they are on. Our guide to selecting the right pump and changeover device covers the options.
Why professionals should specify it
Builders, plumbers, drainlayers and other industry professionals can play a pivotal role in promoting greywater reuse by incorporating systems, like the Promax Slimline Tank, into their projects. By utilising Promax Slimline Tanks, professionals can offer their clients a sustainable and cost-effective water management option that aligns with environmental goals and regulations. Greywater reuse is more than a trend; it's a necessary shift towards sustainable building practices. Promax's range of water storage solutions, including the Slimline tank range, offers builders, plumbers, and drainlayers the tools to implement these systems effectively. Learn how you can include a greywater system in your next project and reach out to our team.