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 Community Tree Planting Day for the Glossy Black Cockatoo is on this Saturday 5 July near Cowra! Learn more about how you can help grow connected landscapes to save the Glossy Black, including more about the Community Tree Planting Day, by fast forwarding to 48mins in our video "Falling in Love with Glossy Black Cockatoos" here: https://www.youtube.com/watch?v=pCERdF21Ud0&t=2075s
Register your interest to join everyone at the Tree Planting Day here:
Join us for this fabulous workshop: Designing Your Future Home on Saturday 19 July (10am-12 noon) Create a Healthy, Comfortable and Energy-Efficient Home
Join local Passive House Designer Karina Rafailov from Earthy Haus for a relaxed, interactive, and inspiring workshop. Whether you’re planning a new build or thinking about a renovation, this session will empower you with the knowledge to create a home that’s healthier for your family and kinder to the planet.
Places are strictly limited in this hands-on workshop so bookings essential here (link in profile): https://www.eventbrite.com.au/e/workshop-designing-your-future-home-tickets-1417752157869
As an increasing number of people are being affected by winter viruses, we’re offering a free session of Tai Chi and Qigong on Saturday 5 July in the warmth of our beautiful Frogs of the Blue Mountains exhibition. Places are limited so book in early here (link in profile): https://bit.ly/40fnGW2 Learn more about these Chinese medicine movement practices in the video interview with Virginia Field on our YouTube channel (link in profile) and read about how Chinese medicine helped her overcome illness as a young woman in our story: Healing Body, Mind and Spirit with Tai Chi and Qigong here (link in profile): https://www.katoombalocalnews.com/tai-chi-and-qigong/
If you’re interested in learning how to propagate native plants and are keen to help our bush regenerate, the Bushcare Seed Collectors meet on the second Tuesday of the month. Check out how they cook Banksias to release their seed and learn more about the group, and native seed collecting, in Katoomba Area Local News here (link in profile): https://www.katoombalocalnews.com/bushcare-seed-collectors/
If you’d like to join the group, contact the Bushcare officer Tracy Abbas on 4780 5623 or email [email protected]
Littlejohni, the Rare and Endangered Northern Heath Frog, photographed in Woodford!
When the Frogs of the Blue Mountains exhibition opened at the Planetary Health Centre in March it featured photos of 20 different local frogs. We were thrilled, however, when Andy Klotz and other members of the Hawkesbury Herpetological Society recently managed to photograph another frog in Woodford: the rarely seen and endangered Litoria littlejohni, also known as the Northern Heath Frog or Orange-bellied Tree Frog. We’ve added a photo of that frog to the exhibition and created a new Frogs of the Blue Mountains video in which you can listen to its call on our YouTube channel. We interviewed Andy to learn more about the Littlejohni and how they managed to find its small local population. You can read this story in Mid Mountains Local News (link in profile). #biodiversity #bluemountainsfrogs #northernheathfrog #litorialittlejohni #bluemountains #woodford #planetaryhealth #hawkesburyherpetologicalsociety...
Our newsletter is now out! Read about how you can contribute to @bluemountainscitycouncil`s Biodiversity Conservation Strategy; watch our video on Falling in Love with Glossy Black Cockatoos; see the new photos of the rare Northern Heath Frog; watch how the Bushcare Seed Collectors cook banksias to release their seeds; learn more about Tai Chi and Qigong, the Chinese medicine movement practices; and take part in our next workshop on Designing Your Future Home with Passive House Designer Karina Rafailov from @earthy_haus
Read it here (link in profile): https://bit.ly/40e4GHr
Our video on Falling In Love With Glossy Black Cockatoos is now up on our Planetary Health YouTube channel (sorry, it`s too big to share here but there`s a link in our profile).
Jayden Gunn finishes his presentation by saying:
"Care is like a snowball. The more people you tell the bigger the snowball gets, and the further it goes. And the more we know, the more we care. And the more we know, the more we`re able to help."
The video is of our fabulous Forum on Growing Connected Landscapes for the Glossy Black Cockatoo, and includes presentations by Jayden Gunn, BirdLife Australia, Amanda Foxon-Hill from Mid Lachlan Landcare, and STEM teacher Samantha Bowden from Glenbrook Public School. There`s a link with the video on how to register for the Community Tree Planting Day in Goologong on 5 July (and it`s also in our profile). Video here: https://www.youtube.com/watch?v=pCERdF21Ud0&t=13s
Today we`re enjoying eating ripe medlars! Medlars are attractive cold climate fruit trees that were popular in Medieval gardens. They`re one of the few fruits that can be harvested in late Autumn and eaten in early Winter when they`re fully ripe. This is a great time of year to plant them for a future harvest. Check out our short video on how to eat them! #coldclimategardens #ediblegardens #medlars #growyourown #planetaryhealth #bluemountains...
We`re thrilled to share that last night @BlueMountainsCityCouncil`s Planetary Health Centre won the Innovative Leadership Award (Population Under 150K) in the 2025 NSW Local Government Excellence Awards. What a great end to World Environment Day! 🌏 This award celebrates how local government can lead transformative change for a more sustainable future. Thank you to everyone who worked so hard with us to make our vision a reality. You can read more about what we`re doing at our website (link in profile): http://www.bluemountainsplanetaryhealth.com.au/ @ph_alliance #planetaryhealth #worldenvironmentday #localgovernmentleadership #nswlocalgovernmentexcellenceawards...
Blocking out a couple of hours a week to step off the treadmill and give ourselves time to nurture our relationship with the earth and ourselves, is one way to keep our creative spirit and ‘lust for life’ alive. If you haven’t done so yet, one opportunity over the next week is to spend some ‘slow’ time in the 2024 Wynne Prize exhibition at the Blue Mountains Cultural Centre before it closes on 15 June. Read more in Katoomba Area Local News here (link in profile): https://www.katoombalocalnews.com/the-2024-wynne-prize/ @bluemountainsculturalcentre @artgalleryofnsw #wynneprize #landscapes #bluemountains #katoomba #artexhibition #planetaryhealth...
Recognising how violence and war impact the health of the planet, the Blue Mountains Planetary Health Initiative has become a member of the Blue Mountains Peace Collective. On Sunday 25th May, we attended a presentation by Dr Keith Suter on Making Peace in the World Today at the Leura Uniting Church. In this powerful presentation Dr Suter questions why we learn about war rather than successful peace negotiations! View the video of his presentation below and read our full story in Katoomba Area Local News here: https://bit.ly/3Fl4WgQ (link in profile)
With an extra day up your sleeve this long weekend, it`s a great opportunity to give nature a hand to regenerate and provide more habitat for our fellow species! Join our fabulous all ages Planetary Health Bushcare Group from 1.30pm and then participate in the Forum on Growing Connected Landscapes for the Glossy Black Cockatoo at 4pm, followed by drinks and nibblies! You can also start the day with a fabulous Tai Chi session at 8am. Visit our Planetary Health Pluriversity website to book in and learn more (link in profile): https://bmpluriversity.org/program/
Or ring 0407 437 553 for more information. #planetaryhealth #bushcare #katoomba #bluemountains #glossyblackcockatoos #landcare #biodiversity #habitat #wearenature #togetherwecan...
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!
Last week around 160 first year medical students were introduced to Planetary Health and Dharug culture at the Planetary Health Centre, with presentations by Professor Lynne Madden from Notre Dame, Lis Bastian from the Planetary Health Centre and Dharug man Chris Tobin.
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