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    Following is general information on Greywater (or graywater) . For a design and quote for a Greywater (or graywater)  RE-USE System for your situation please e-mail me so that we may discuss your System further.

    A Greywater Re-Use System is a grey water system designed to treat domestic wastewater excluding toilet waste. Councils are increasingly reluctant to allow homeowners to dispose of grey water without basic treatment. The days of being allowed to spray wastewater untreated onto the garden are over. Each State and Council have their own regulations and you will need to contact your local council to establish what they will permit alongside a waterless toilet. The following explains the situation primarily in NSW. Please note however that there are variations from State to State & from Council to Council.

    Primary treated wastewater must be disposed of in sub-surface trenches, irrigation, or evapo-transpiration (ETA) beds. Septic tanks are the main example of systems that treat only to the primary level. Secondary treated water can be disposed of below ground, for example, by drip irrigation lines under mulch. Disinfected secondary treated water can be disposed of at ground level and in some cases by spraying in pre-designated areas. Aerated Water Treatment Systems (AWTS) treat to secondary level. Such systems include a disinfection unit, most commonly using chlorine. These systems typically cost around $8,000 plus in ground installation. There are then annual inspection and maintenance fees plus wear and tear on the pumps and aerators and electricity costs totalling some $800-1,000 or more per year.

    In order to satisfy the Australian Standards (AS1547) requirements a grey water re-use system which cleans waste-water via a grease trap and gravity fed primary treatment can be used. You can use the Greywater Re-Use System for disposal of the water via trenches, shallow sub-surface irrigation, or ETA beds. Suggest the Greywater Re-Use System to your geo-tech engineer and/or council.

    Your council will probably ask you for a site plan. You may need to engage a Greywater Re-use Design consultant or geotechnical engineer to test your soil and produce a plan for distribution of the treated water. Make sure the consultant or engineer allows for the lower volume of water associated with a waterless toilet. This should result in an EDA (Effluent Dispersal Area) only 65% of the EDA for septic systems or AWTS  handling both black (toilet) and grey water.

    We have found that some consultants & engineers have not had experience with composting toilets and so may not want to design a system around a waterless toilet. You should check before engaging anybody that they are happy to work with you in designing a system which is based on waterless toilets.

    The Greywater Re-Use System is explained below.

    The Greywater Re-Use System provides a simple and low cost effective means of treating grey water. Not only is the equipment low cost, but also, if your site is suitable, the only excavation work required to install the system will be the trenching. The ongoing costs will be less than those of a standard septic system.

    The filtration tank, which is less than 1 cubic meter in size, consists of a pine bark coarse filter on top of a Bio-Mass filter. The coarse Pine Bark filter removes large particles & fats from the kitchen, and lint from the washing machine normally caught in a grease trap. Compost worms can be used in this layer. The filtered material and bark will compost over time and should be removed every 6-12 months and replaced with fresh bark, available form your local garden nursery. The pine bark is separated from the Bio-Mass by filter cloth. The Bio-Mass filter treats still finer materials, converting the organic content of the water into water soluble nutrients that can be used by your trees and plants. The final stage of primary treatment to is flowing over the bio-film on the 20mm aggregate at the base of the Greywater Re-Use System tank. If your distribution area is down hill from the filtration tank your engineer/consultant should be able to design a distribution system without the use of a pump. If this is not the case you will need a pump well.

    Adobe Loos & Worms can prepare a Greywater (or graywater) Re-use Design that is suitable to submit to Council. The Design will include a Specification and Schematic Plan of the System, a Water Balance and Components listing.  If you require us to do this please contact us for a quote on design costs starting from $190.

    The advice given above is offered only as a guide. We recommend that you seek advice from your council plumbing inspector, but do not be deterred from your decision to use a  composting toilet unless the inspector can identify in writing why it is unsuitable for a particular location.   

    In NSW you can submit for Council approval your own greywater (or graywater) treatment system using a Greywater Re-use Treatment System for use in connection with subsurface irrigation. See NCG System & NCP System for proposed Designs.

    Q: Your Waterless Composting Toilet will keep you from polluting & wasting precious water by flushing it away. But what about the rest of the water you use? How can you make the most of it, rather than just using it once to wash your dishes, or your clothes, or yourself? 

    A: Clean your greywater (or graywater)  and use it again to quench your garden's thirst.


    Q: How do I clean my greywater


    A: Read on to:


    Greywater Re-use Treatment System         
    Greywater Diverter System



    Links on this website open Adobe Acrobat PDF files, click the following link to get this program for FREE:

    Quick links Brochures
     to Greywater
    (or graywater)
    Greywater System & Diagrams & Price List

    ABC Interview on domestic greywater re-use
    with Kym Mogridge

    Greywater Article
    by Liz Worth

    Using Greywater
    Alternative Technology Association

    Gravity System Plans

    Pump System Plans

    Buyers Guide by the RENEW MAGAZINE - Greywater Buyers Guide

    Low cost Branched Drain System for those on a very low budget

    Price List & Order Form

    Ode To Water - an interesting audio

    Laundry to Landscape system, a new DIY system that is even simpler and more economical than the branched drain system.
    This link is presented with permission. You can purchase Create an Oasis with Greywater from Oasis Design. Follow this link to a great deal more information on greywater from Oasis Design. .



    If you would like to contact us please

     phone 02 6494 1051 or 0427 277 249 or (overseas 61 2 6494 1051)
    You can even snail mail to
    Adobe Loos & Worms, PO Box 751, BEGA  NSW  2550  Australia


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    Greywater or graywater.
    It seems that greywater is the Australian spelling and graywater is the American spelling.
    Both greywater and graywater are correct spelling, just depends on where you live.
    So hopefully, if you have searched for greywater or graywater you will end up here.