Leni Nyssen of Alchemy Farms with her simple reed bed filtering system.
Story and photos by Linda Moon
Setting up a basic system for recycling grey water is cheap, easy and worthwhile.Read about a garden in North Leura and learn from a permaculture designer how it can be done.
Key Points:
Save money and time watering, reduce water waste and hydrate your garden by reusing grey water.
A local permaculture designer explains how she created a simple setup.
Learn the local rules and regulations around using grey water.
“We want to grow a lot of food, and we have kids and do a lot of washing, so what better way to use that water than out to the garden.” Leni Nyssen of Alchemy Farms Permaculture Design is showing off her basic grey water filtering system: a simple version of a ‘reed bed system’ which actually looks easy to set up.
The permaculture consultant and educator’s backyard (in North Leura) is littered with sprawling veggie patches and kids’ toys, a rambling dog and chickens. The message: you don’t have to be wealthy, a plumber, living on acreage or even a homeowner to re-use your grey water.
What is grey water?
It’s the wastewater from our bathrooms and laundries. With relatively less chemicals, fats and biological matter than dark grey water (from the kitchen) or black water from toilets, it’s the recycling go-to of wastewater.
By re-using her washing machine water, Leni reckons her system waters most of the garden for her. The family’s washing machine uses an estimated 80 to 100 litres per load.
Leni’s reed bed system
From the washing machine hose, plastic piping dangles downstairs into an old bathtub at the side of the house. Gravity (Leni’s washing machine is on the second floor) propels the water forward.
The bath contains stones, gravel, sand, reeds and other water loving plants. Based on the concept of wetlands, these are partitioned into a series of sections, including a mini pond area, that slows the water flow, filtering and cleansing it. Having a smaller outlet than inlet, also helps stem the flow, Leni explains. The whole process takes about 20 minutes.
There’s no odour. “It’s only when there’s storage and bacteria starts to get active, that it starts to smell,” she explains.
The grey water is fed to the garden via outlet hosing attached to the bottom of the bath. As the garden slopes gently downhill, there’s no need for a pump. Too easy!
The grey water is fed into deep mulch-covered swales (trenches) in the food forest area to help grow fruit trees, vines and perennials.
Is grey water okay for the garden?
Leni, who studied permaculture design and education with Geoff Lawton and Rowe Morrow, views grey water recycling as another helpful method for improving soil moisture and the resilience of our gardens to dry conditions. She says, “the real focus in permaculture is slowing water and spreading it and soaking it into the landscape.”
“Living in such a fire-prone area, we need to focus on making sure the landscape is hydrated” – Leni Nyssen.
The main issue with grey water is sodium, which in turn affects soil pH. Grey water from the washing machine (laundry products tend to be high in sodium) usually makes soil more alkaline. Phosphates, oils and chemicals are other common problems in grey water.
For the laundry, Leni recommends soap nuts (which you can get from the Blue Mountains Food Co-op), or pure soap flakes. “That has the least impact when it goes out to the soil,” she says. “The main thing is it [grey water] should go to the root systems rather than leaves that you’re going to pick and eat.”
Leni Nyssen’s permaculture garden gains the advantage of extra hydration from grey water over summer.
More options for using grey water
A reed bed bath system isn’t your only option.
Buckets: Catch water in the shower, bath or basin or the rinse cycle of the washing machine.
Water diversion devices: Inexpensive and can be installed by a plumber. Alternatively, use a grey water diversion hose attached to your washing machine. Bathroom or laundry water can be diverted into your land (such as trenches, swales and basins around trees) but should be cooled in a holding trench or other collection point first.
More expensive and complex domestic waste water treatment and storage systems with pumps, filters and more.
Note: with any drip irrigation or ag-piping containing holes, filters are a must to avoid them getting clogged with lint, hair and other stuff.
A grey water diverter for sale at a local hardware shop is an inexpensive option.
Wise and safe grey water use
Also check out these tips from the experts:
Use the most eco-friendly, low-sodium, low-phosphate laundry and personal care products possible.
Don’t use water after dyeing your hair, cleaning the bath, basin and so on. Bleaches, drain cleaners, disinfectants, hair dyes, shampoos, toothpaste, mouthwash, perfumes and many other products contain chemicals and other ingredients harmful to soil health (and possibly to you too!).
Don’t use grey water on vegetables, herbs and root veg.
Don’t store untreated grey water for longer than 24 hours to prevent bacteria build-up.
Distribute grey water to the subsurface. Don’t let it pool on the surface: a recipe for bacterial or algal bloom.
Don’t use water from washing nappies.
Regularly monitor and maintain any reed beds for bacteria and algae.
Never use hot water directly on the garden. It will kill beneficial soil organisms.
Don’t let pets or wildlife drink grey water or let kids play in it.
Give your garden regular breaks from grey water.
Monitor soil health and pH. Regularly add organic matter to soil.
Avoid watering acid-loving plants, like berries, camellias and rhododendrons, with grey water.
Try “hydro zoning” your garden according to water needs. Position plants with similar water needs together. Direct grey water to the most thirsty.
Know the rules
You don’t need council approval to re-use grey water on your land, but you do have to abide by certain rules around its use. These include only using it to irrigate the sub-surface of your garden using pipes / hose 100mm below the ground and avoiding using it during rainy periods and if someone at home has a contagious disease. Purple hoses and fittings should ideally be used to identify grey water recycling.
Watch the video (below) about Leni Nyssen’s reed bed system. Leni can offer guidance on how to create your own DIY system, as well as advice on how to live more sustainably and ecologically.
This story has been produced as part of a Bioregional Collaboration for Planetary Health and is supported by the Disaster Risk Reduction Fund (DRRF). The DRRF is jointly funded by the Australian and New South Wales governments.
The inaugural Blue Mountains Food Security Fair kicks off at 9am today at the Planetary Health Centre in Katoomba. Pop in to listen to a talk, watch a demo, grab a coffee and sweet treat from Good Fat Pastry, a delicious lunch from Bibi`s Kitchen, fresh mushrooms from EarthRising Mushroom Farm, locally acclimatised vegetable seeds from Mid Blue Mountains Seed Savers, and edible native plants from Muru Mittigar Ltd You can view the full program here (link in profile): https://bit.ly/4nOSJle The Planetary Health Centre is at 33-39 Acacia St (former Katoomba Golf Course).
The Fair is a World Animal Day event and has been supported by a sEEd grant from the Australian Association of Environmental Educators.
A huge thank you to Richard Burrell from Muru Mittigar Native Nursery who delivered us the following edible natives to sell at our Food Security Fair on Saturday 18th October:
Apple Berry Finger Lime Mat Rush Lomandra longifolia Midgen Berry Native Leek Native Parsnip Native Raspberry Female and male Pepper Berry Vanilla Lily Yam Daisy
You can view the full program for the Food Security Fair here (link in profile): https://bit.ly/4nOSJle
We`re thrilled that EarthRising Mushroom Farm will be at the Blue Mountains Food Security Fair this Sat 18 Oct with their fabulous fresh mushrooms, mushroom grow kits and other mushroom products. Alex can help you get started on mushroom growing and let you know more about the mushroom compost you can pick up from the Farm in Lawson. View the full program for the day here (link in profile): https://bit.ly/4nOSJle The Fair is at the Blue Mountains Planetary Health Centre: 33-39 Acacia St Katoomba (former Katoomba Golf Course)
Such an amazing program for the Food Security Fair at the Planetary Health Centre in Katoomba on Sat 18 Oct: from the renowned Holly Davis, co-founder of Iku, and author of Ferment, giving a hands on demonstration of how to preserve and increase the health and deliciousness of food through fermentation, to Dr Milena Bojovic from UTS on the Future of Food! Dr Teya Brooks Pribac from Plant Inspired will demonstrate innovative plant based cooking techniques, Michael from Good Fat Pastry will share baking innovations, Marnee Fox from Forage to Feast will share how to use Wild Edibles, seed saver extraordinaire Lloyd Sharp from Mid Blue Mountains Seed Savers will share his amazing expertise and launch the Upper Blue Mountains Seed Savers and Gardening Group, Manu Prigioni from Farm it Forward will discuss equity and nutrition security and Farm it Forward’s response to the National Food Security Strategy document, Erin Hall will provide a hands-on Weaving with Weeds workshop, and Nev Sweeney will share how to build and use a solar food dehydrator. Places are limited so bookings essential here (link in profile @bluemountainsplanetaryhealth : https://events.humanitix.com/food-security-fair-or... This event has been supported by an Australian Association for Environmental Education sEEd grant.
Social enterprise @farmitforward is working to increase local food security one backyard after another, and with young people at Katoomba High School. At the Food Security Fair on Sat 18 Oct, co-founder Manu Prigioni will speak about Incorporating equity and nutrition security in discussions on food security: Farm It Forward’s response to the National Food Security Strategy document. Reserve your spot for her presentation here (link in profile): https://bit.ly/4nOSJle Read more about Manu and Farm it Forward in Katoomba Area Local News here (link in profile): https://bit.ly/46PTAfF
Join seed saver extraordinaire Lloyd Sharp, from Mid Blue Mountains Seed Savers, as we launch the Upper Blue Mountains Seed Saving and Gardening group at the Food Security Fair on Sat 18 October. Lloyd will share some of his extensive seed saving experience, and there will be an opportunity to purchase and share local seeds and plants. Huge thanks to Happy Valley Seeds for donating heirloom seeds and discount cards, and to @thediggersclub for generously donating Vegetable and Flower Sowing Guides and their 2025/2026 Heirloom Seed Annual. There will be one for every attendee! The Food Security Fair is being held at the Blue Mountains Planetary Health Centre 33-39 Acacia St Katoomba and the Seed Saving presentation is at 10.20am. Bookings essential here (link in profile): https://events.humanitix.com/food-security-fair-or-planetary-health-initiative
Nev Sweeney, renowned permaculture teacher and practitioner, from Under the Choko Tree, will be leading a workshop on how to build and use a solar food dehydrator at the Blue Mountains Food Security Fair on Saturday 18 Oct. Nev will talk about why food dehydration is a good idea, some techniques that can be used to dry food, pretreat or not to pretreat, general tips and considerations about food drying, drying fruit and veg, testing for dryness and using dried produce. He will explain how he made a simple direct solar food dryer and a more complex indirect solar food dryer. Reserve your spot here (link in profile): https://events.humanitix.com/food-security-fair-or-planetary-health-initiative
Planetary Health volunteer, American permaculture teacher Susan Krings, has been helping to organise the inaugural Blue Mountains Food Security Fair. If you`d like to learn more about volunteering at the Centre email [email protected] or ring 0407 437 553
You can purchase tickets for the Food Security Fair in Katoomba on Saturday 18 October here (link in profile): https://events.humanitix.com/food-sec...
The day will include stalls, talks and demos about growing, sourcing, cooking, preserving and enjoying plant based food and protecting habitat for wildlife. The event is part of a series celebrating the centenary of World Animal Day.
The fabulous line up of speakers and workshop tutors includes Dr Milena Bojovic on the Future of Food; Holly Davis, co-founder of Iku and author of `Ferment`; Michael from Good Fat Pastry; Nev Sweeney from Under the Choko Tree on how to build a Solar Powered Food Dehydrator; Lloyd Sharp from Mid Blue Mountains Seed Savers; Marnee Fox from Forage to Feast; Teya Brooks Pribac from Plant Inspired; and Erin Hall on Weaving with Weeds and Manu Prigioni from Farm it Forward.
Stalls will include EarthRising Mushroom Farm, Bibi`s Kitchen, edible native plants, the Planetary Health Cafe and more.
Each session needs to be booked individually as numbers are strictly limited.
This event is being supported by a sEEd grant from the Australian Association for Environmental Education.
At the Food Security Fair on Sat 18th October the inspiring Teya Brooks Pribac, author of ‘Not Just Another Vegan Cookbook’ and founder of Plant Inspired, will be sharing innovative but very simple culinary techniques that can help you make delicious icecream, ‘egg` sandwiches and a wide range of cheeses without any eggs or dairy. Food that’s healthier for you and the planet. You no longer need to worry if the supermarket shelves suddenly don’t have eggs, or if you can’t afford them! There are so many cooking techniques that can help us create our favourite foods, without requiring animal products! The session will end with one of Teya’s fabulous cheese tastings. Bookings essential for this fascinating workshop here (link in profile): https://events.humanitix.com/food-security-fair-or-planetary-health-initiative
This event is one of a series celebrating the centenary of @worldanimalday @ph_alliance
In Marnee Fox’s session on Wild Edibles at the Blue Mountains Food Security Fair on Sat 18 October, she’ll share how to incorporate wild ingredients into your every day diet AND make it delicious. Marnee Fox is a sustainable interior decorator, stylist, foodie and weed convert. She`s also one half of Forage to Feast Australia with husband, renowned environmental educator Diego Bonetto. Building on Diego`s much-loved weed foraging workshops, Marnee takes the food found on the foraging tour to the table. Bookings essential (link in profile): https://events.humanitix.com/food-security-fair-or-planetary-health-initiative
If you haven`t yet tried the deliciousness of Good Fat Pastry you`ll be in for a treat at the Food Security Fair on Sat 18 October! Join Michael, the creative baker producing these mouthwatering plant based (and mostly gluten free) treats for breakfast, where he will inspire you to rethink everything you know about baking:
"Baking is both borne and constrained by convention—as are our expectations. Since Ancient Egypt and Rome, eggs, dairy, and cereals have been used in baked goods for flavour and functionality. The enormity of cakes, pastries, biscuits, and desserts we know and love—and the countless we have no awareness of—have been discovered and created through spontaneity and experimentation. Almost always resting on the magical transformations of these key ingredients under heat and energy.
Yet as the realm of food is one of creativity and sensory inquisitiveness there are inherent possibilities for alternatives—in replicating the familiar as well as creating novelty. This path can follow the complexities of molecular gastronomy or the simple pragmatism of substituting with what`s on hand. Find whatever works for you."
Spaces are limited so bookings essential here (link in profile): https://events.humanitix.com/food-security-fair-or-planetary-health-initiative
One of the highlights of our Food Security Fair on Sat 18th October is our Weaving with Weeds workshop at the Planetary Health Centre in Katoomba. In this relaxing and enjoyable workshop Erin Hall will help you identify common invasive weeds that are ideal for basket making, and teach you the basic skills to weave a range of different objects. At the same time you`ll be removing and repurposing weeds that are destroying habitat for our wildlife! Places are limited so bookings essential here (link in profile): https://events.humanitix.com/food-security-fair-or-planetary-health-initiative
Linda Moon has lived in the upper Blue Mountains since childhood and is a freelance writer for Australian media. A qualified naturopath, permaculture designer, mother and former student of social work, her passion is building local community, gardening, mental, emotional, social, housing and environmental health – all of which are linked!
Dave Spees, Katoomba-based carpenter and founder of Against the Grain, has turned the by-product of his craft into a sustainable, sought-after winter fuel. His compressed sawdust briquettes are now helping to heat homes across the Blue Mountains, all while dramatically reducing landfill waste.
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