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Introduction The Greywater Saver Greywater Reuse System can


Introduction The Greywater Saver Greywater Reuse System can

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    The Greywater Saver Greywater Reuse System can provide a long-term means of
    conserving your greywater for garden irrigation rather than having it wasted to sewer
    or the onsite wastewater system. It is constructed of robust materials so it will
    continue to conserve that water for many years. However, so it can operate effectively
    in the long term it is important to ensure that it is correctly installed from the
    beginning as detailed in these installation notes.

    By law, only a licensed plumber (is the authorised person) permitted to install the
    Greywater Save diverter unit, whereas a licensed plumber drainer or anybody capable
    can generally install the filtered greywater distribution pipework and irrigation
    trenches (see exceptions page 10). However, to ensure the irrigation system is
    correctly installed it is recommended that this work only be done either by or under
    the supervision of a licensed plumber or drainer.

    Make sure your plumber gets to see these installation notes and a copy of your local
    government approval before he commences any works.

    Local Government Approvals Required
    Generally approval to install any wastewater or greywater reuse system in Australia
    must (by law) be obtained from the approving authority (generally the local
    government), prior to commencing any installation work (see state/territory
    exceptions page 10). Once those works have been completed the local government
    may inspect the installation, to confirm it is as was approved, or it may alternatively
    accept certification from a licansed plumber responsible for the installation. Further
    information about this can be sought from your local government or the approving
    authority. However, generally before any approval to install the greywater reuse
    system is given, the approving authority will want to be satisfied that:

      1. The greywater reuse system is one that has authorisation from the state onsite
         wastewater and/or plumbing authorities. The Greywater Saver has these
         authorisations in the states and territories listed at page 10.

      2. The proposed greywater trench irrigation system meets minimum sizing
         requirements and will be located to satisfy the required minimum
         setbacks from features such as buildings and boundaries etc. These points
         are detailed further on in these installation notes.

      3. The appropriate local government application fee has been paid. This fee varies
         between states and territories and between local governments and some may
         charge no fee for the approval. See more page 10 and ask your local

* IMPORTANT Advice to Plumbers on Installing The Greywater Saver Unit
 Whilst all plumbing works must generally comply with the requirements of
 AS 3500 the Greywater Saver Diverter Vessel requires it be installed so:

1. The Diverter Vessel is required in some states (eg: WA) to be installed so its failsafe
      overflow point is situated a minimum of 150 mm higher than the plumbing system's
     overflow relief gully, unless the wasteline it is fitted with an anti-backflow check
     valve to protect against sewer surcharge. (see figure 2 ). However, this is not
    requirement in all states and plumbers should seek the plumbing regulator's advice
2. The Greywater Saver Reuse System is not designed or intended to receive kitchen or
     dishwasher greywater.
3. The Greywater Saver Diverter Vessel must be installed (see figure 1 )
      suitably clear of any structure that will inhibit the free access by users:
      * to allow them to remove or replace the screw cap access cover
      * to view the inside of the vessel for accessing the mesh filter basket for cleaning
      * to open or close the push-pull gate valve knob
4. The Greywater Saver Diverter Vessel must be secured in a fixed position on a solid
    wall or similar solid structure using the clamps/support brackets, provided with the
    unit, so operation of the push-pull valve or removal of the screw cap access cover
    by users will not cause excessive flexing or rotational forces to be applied to and
    damage the vertical waste pipe (see figures 3 ). In situations where there is no suitable
    stable structure available to secure the unit (as might be the case for
     developments with limestone or timber stump footings), use of two rigid
     steel channels set into a concrete base or similar should be used to provide
     a stable solid base to which the Greywater Saver Diverter Vessel can
     be affixed using the clamps/brackets provided. (see example figure 4 )
 5. The Greywater Saver Diverter Vessel can be installed to receive greywater from a
      single greywater fixture or where possible to receive multiple greywater fixtures
      brought together into a single common vertical waste pipe. However, note that
     AS 3500 will require that this common vertical waste pipe be vented for such a
 6. If the unit is being fitted to reuse greywater from a fixture that currently discharges
      to a floor waste gully, it is essential to ensure that the floor waste gully water-trap
      will be continually replentished with water to prevent the entry of sewer gas into
      the building (ie. ensure that it will continue to receive water to maintain the water
      seal within the floor waste gully).
 7. Where you are the person responsible for installing and/or certifying
      the irrigation system, ensure you have sighted and are familiar with
      the conditions of approval for the system's installation in your state
      or territory (eg: the local government or other approving authority
      approval) see details pg 10.
  8. When glueing the unit to the vertical wastepipe be careful to ensure excess glue
      does not fall into the gate valve.
The Greywater Piped Trench Irrigation System
A piped trench irrigation system is sized on the basis that the system must provide effective long term
operation without failure and sibsequent risk to public health, and is sited on the basis that minimum             * 200mm x 200mm aggregate filled irrigation trenches sized as detailed in the table
setbacks from buildings and boundaries are achieved to protect the integrity of adjacent structures and              below, based on soil type, winter irrigation not occuring, number of bedrooms or
properties. These setback requirements can vary a lot between Australian states/territories and advice               persons, and the fixtures connected to the reuse system. However, use of larger
on the required setbacks should be obtained from your Environmental Health Officer for the current                   trench dimensions for shorter lengths, or other approved irrigation designs and
requirements in your locality. Generally the principal setbacks are from buildings and boundaries can                means of distributing filtered greywater will be permitted where these comply
range from 0.5m -1.2m in WA, up to 2.5m in SA. Remember to consult your Environmental Health
                                                                                                                     with the requirements of the Local Government and Health Authority in your state.
Officer for detailed information about the minimum setbacks required in your state/territory.
                                                                                                                     Further advice may be obtained about other options from your local government
These Greywater Saver installation instructions provide recommended minimum irrigation trench                        Environmental Health Officer or the onsite wastwater regulator in your state.
lengths (see page 5) and design but users may utilise larger or other approved trench irrigation designs              TABLE: Minimum Recommended 200mm x 200mm Irrigation Trench Lengths *
or sizings if these are acceptable in your state/territory. Approving state or territory authorities will either                                                                 Bath &
                                                                                                                     No. of bedrms    Bath   Lndry    Bath &   Bath     Lndry             Bath        Lndry       Bath &
base their irrigation sizing requirements on the number of bedrooms or the number of persons (see                                     only   only              only     only     Lndry    only
                                                                                                                          or                          Lndry                                           only        Lndry
page 10 for your state/territory's method). *Longer trench lengths will be preferable when climatic                                   sand   sand     sand     Loam     Loam     Loam     Silt/Clay   Silt/Clay   Silt/Clay
                                                                                                                     No. of persons                                              Gravel
                                                                                                                                                               Gravel   Gravel
conditions permit year-round irrigation or when installed in poorly drained clay soils. Question your
                                                                                                                     1 to 3 bdrm or
Environmental Health Officer for his advice on this.                                                                 up to 6 person 6.7m      4.2m    10.9m    10.5m    6.3m     16.8m     15.8m        9.8m      25.2m
                                                                                                                      4 bedroom or 8.6m       5.3m    13.9m    12.9m    7.9m     20.8m     19.4m       11.9m       29.1m
The recommended greywater trench Irrigation System (see pages 6 & 7) incorporates:                                    up to 8 person
 * 50mm DWV PVC distribution pipes with suitable bend fittings to carry filtered greywater (under                    5 bedroom or                              15.5m                                  14.1m       37.4m
                                                                                                                     up to 10 person 10.3m    6.3m   16.6m              9.4m     24.9m     23.3m
gravity) from the Greywater Saver Diverter Vessel to the piped irrigation trenches. The distribution pipe
                                                                                                                   * sized on the basis that greywater will be diverted in the wet season/winter.
system must be laid with a continuous grade not less than 1:40 so filtered greywater will not be                   * in locations where climatic conditions allow year round irrigation or in households with
trapped or allow any fine sediments to accumulate in any undulating sections. *GS80 model users                      above average populations irrigation trench lengths may need to be increased in length.
                                                                                                                   * in heavy clay soils irrigation trench lengths may need to be increased in length in
need to uitilise an 80mm to 50 mm DWV reducer fitting no less than 1 metre away from the GS80                        consultation with the approving authority. (ask your local government)
outlet (ie, as a minimum the first metre of distribution pipe must be 80mm DWV ) see figure 8.                     * in N.T. soils are classified as either sand/loam, loam or loamy/clay and these soil types shall have
                                                                                                                     minimum irrigation trench sizes as given above for sand, loam/gravel and silt/clay, respectively.
                                                                                                                   * where a lesser population for the corresponding number of bedrooms as detailed above is present,
 * A number of 50mm Y junction Greywater Saver Flow Splitter fittings suitably located along the                     the required irrigation trench lengths must be the minimum for the corresponding number of
50mm distribution pipes to evenly split and distribute the filtered greywater to each of the intended                bedrooms (Eg: for 6 persons in a 5 bedroom house the trench length shall be sized on 5 bedrooms.)
                                                                                                                   * in Tas these recommended irrigation trench lengths may not be acceptable and they must be sized
irrigation trenches (see figure 8).                                                                                  having regard for site conditions using AS1547 and the requirements of the local government.
                                                                                                                    Ask your local government Environmental Health Officer for advice.
 * A chosen number of 200mm x 200mm piped irrigation trenches consisting of 90mm PVC rigid pipe                     Design and Installation Steps
with 20mm holes at 500mm centres and end caps laid level in an aggregate (rock) filled trench                       200mm x 200mm Piped Trench Irrigation System
200mm deep and 200mm wide. The aggregate trench is covered by geofabric material to stop the                          1. Determine the minimum trench lengths required for your development
ingress of soil and then covered with a minimum 100mm & maximum 200mm of soil (see figs 5 &                         from the above table. For non-residential developments it is necessary to
6)                                                                                                                  determine the likely maximum daily greywater volume to size the irrigation
                                                                                                                    system. Likewise, use of larger irrigation trench dimensions with greater
 * Users/installers are required to pre-prepare the irrigation trench 90mm PVC pipework before
                                                                                                                    surface area will reduce the minimum trench lengths required. Further advice
installation by drilling 20mm holes on opposite sides of the 90mm pipes along their length at
                                                                                                                    on these matters of sizing can be discussed with your local government
500mm centres (see figures 5 & 11). The 20mm holes are drilled at the same level along the
length of the pipe sides so irrigation water can flow out of all holes. Removal of burs around the                  Environmental Health Officer.
egdes of drill holes is required to avaid suspended matter being caught over time and effecting
the flow. One of the 90mm pipe end caps has a suitable hole be drilled through it for connecting                      2. Identify suitable existing garden beds or locations for new garden beds
the distribution pipe (see figure 7).                                                                               that can be reached by gravity from where your greywater saver diverter
                                                                                                                    vessel is to be located. For example; using a downward grade of 1:40 for the
 * Joins along the 50mm DWV pipe, flow splitter Y junctions and other couplings are permanently                     distribution pipe on a flat site, and a maximum piped irrigation trench base
glued together using PVC cement. Connection of the 50mm DWV pipe to the 90mm irrigation                             depth 400mm below surface (with the 90mm pipe 300mm below surface and
trench pipe end cap is inserted loosely and not glued. (see figure 7 ).                                             the 50mm distribution pipe below surface for the entire distance), a piped
                                                                                                                    trench irrigation will need to be located within around a ten metre of the
4                                                                                                                   diverter vessel. Sloped sites will obviously not have this distance limitation                            5
                                                                                                                    when irrigation trenches are being located down slope.
 3. Plan a 50mm distribution pipe, Y junction and irrigation trench layout. For example:
                                                                                                   8. In the 300mm-400mm deep irrigation trench excavations (depth set to suit
You are reusing your bathroom water from a 5 brm home and the soil is sand. From the
                                                                                                connection with the 50mm inflow pipe) lay two separate 500mm wide strips of
table on page 5 you require a minimum 10.3 metres of irrigation trench and you have
                                                                                                geofabric or similar material down trench sides so the strips reach the bottom of the
identified four garden beds for piped trench irrigation. Therefore you will be required to
                                                                                                trench, but do not cover the base, and extend over the side top edges of the trench,
split the single filtered greywater stream leaving the Diverter Vessel into four streams.
                                                                                                and hold in place using suitable weights such as timbers or rocks. Backfill the trench
This is achieved by using three Greywater Saver Flow Splitter Y junction fittings (as
                                                                                                to a depth of approximately 60mm with the 20-40mm aggregate. Lay the 90mm pipe,
shown in figure 8) so each garden bed has one ~2.5 metre irrigation trench.
                                                                                                which have 20mm side holes already drilled along their length and end caps already
Alternatively, by reconfiguring the position or number of Y junction fittings you might
                                                                                                fitted, along the top of the partially aggregate filled trench ensuring the opposite side
split the flow to have (1 x 5m and 2 x 2.5m trenches), or ( 1 x 5m, 1 x 2.5m and 2 x 1.25m
                                                                                                holes are set level to each other and using a spirit level and straight length of timber
trenches). Trenches may be installed with bends using suitable elbow fittings and may
                                                                                                or similar, ensure the entire pipe length is set aproximately level without undulation or
be sized to be longer than the recommended minimum.
                                                                                                low points.
  4. Layout the distribution pipe, Y junctions and trench pipe on the ground surface
                                                                                                   9. Connect each of the 50mm distribution pipe ends into their intended 90mm
ensuring the distribution pipe can connect into the end of the irrigation trench pipe
                                                                                                irrigation trench pipe end cap ensuring the 50mm pipe is inserted into the drilled end
(see figure7.) The Y junctions must be located on the distribution so that the 50mm inflow
                                                                                                cap so greywater will enter the upper level of the 90mm pipe (see figure 7) and
distribution pipe has no bends or elbows located within 500mm of it connecting into the Y
                                                                                                making sure not to interfere with the flow split setting. The 50mm pipe is not glued to
junction, as bends can cause turbulence in the flow and effect the Y junction's ability to
                                                                                                the 90mm end cap but simply inserted so it extends aproximately 100mm through the
achieve an equal split of the water (see figure 8). Dig the trenches where pipes and
                                                                                                end cap hole. Once connected, release some water through the greywater diverter
irrigation trenches will be installed making sure not to dig deeper than required and
                                                                                                vessel so you may make further minor level adjustments to the 90mm pipe and
ensuring a downward grade will be achieved on the 50mm distribution pipe and Y
                                                                                                release more water until water fills up to and spills out of the drilled side holes fairly
junctions between the beginning and ends, so the water will flow by gravity through
                                                                                                evenly along its length. (see figure 11)
the pipe. When digging the piped irrigation trenches using a spirit level ensure the base
of the irrigation trench is relatively level so irrigation water can soak in over the entire
                                                                                                 10. Back fill the trench with 20-40mm aggregate to 200mm overall depth. Fold the
trench length rather than just flow to a low section .
                                                                                                geotech material top edges over the aggregate surface and backfill the renmainder of
                                                                                                the irrigation trench with soil (see figure 6).
 5. Working away from the Greywater Saver Diverter Vessel outlet lay distribution pipes
out, and glue the diverter vessel and 50mm distribution pipe joins together but only up
to and not including the first Y junction fitting.

 6. Once the glue on the distribution pipes has set a few minutes the first Y junction can
then be temporarily set into position (but not glued) to establish the best position to
split the single incoming greywater stream into two equal volume streams. The Y
junction should initially be set into place using a spirit level across the two outlet points
so these are level, but for precise calibration this should be measured by releasing a
small volume of greywater through the system and collection of the two stream in
separate containers to check the split, followed by minor rotation to the fitting until an
even split is achieved. (see figure 10)

  7. Once the equal water split position is established mark both the Y junction and
distribution pipe join at corresponding points before removing the Y junction so it may
be glued permanently into the marked position. (see 10). Once the glue has set a few
minutes continue to connect and glue further distribution pipe and Y junction fittings
using the same water measuring and calibration technique with each subsequent Y

8                                                                                                                                                                                        9

WA - In sewered and unsewered areas
    - Seperate Local Government application fees and approval required before installation
    - Irrigation trench sized on number of bedrooms.
ACT - In sewered and unsewered areas
    - No seperate approval or application fees required but check with ACTPLA & ACTEW on
       their recommendations before commencing.
    - Irrigation trenches sized on the number of bedrooms
    - irrigation trench setbacks generally the same as WA (ie. 1.2m from buildings, 0.5m from
      boundaries, and standard health setback requirements from water supplies, drains/creeks
      etc) check with ACT Health for advice.
SA - In sewered and unsewered areas
    - Seperate application fees and approval required from either the Local Government or SA
       Dept Human Services. (ask local government)
    - in sewered areas a seperate approval is required from SA Water.
VIC - In sewered and unsewered areas.
    - Seperate Local Government application fees and approval required before installation.
    - Irrigation trenches sized on the number of bedrroms.
NSW - In sewered and unsewered areas
    - Local authority approval of the system's use (including the irrigation system) is required
       before use. Make sure you obtain this approval before installing the system so you are
       familiar with any conditions which might be applied by the local government or effect
       the way it is installed. Fess may or may not apply.
     - approval is required from the local authority to carry out sewerage works, unless the sewer
       system is controlled by the Sydney Water Corporation or the Hunter Water Corporation or
       on land to which the Water Supply Authorities Act applies, and in which case the
       requirements of the water authority should be determined before proceeding
     - for irrigation trench sizing basis ask your local government Environmental Health Officer
       for advice.
QLD - In unsewered areas only pending legislative changes being progressed now.
      - Seperate Local Government application fees and approval required before installation.
      - for irrigation trench sizing basis ask your local government Envirobnmental Health Officer
        for advice.
 NT - Approved for use in sewered and unsewered areas.
     - Local Government Authorities are not responcible for approving installations in the NT.
     - These installations are predominantly certified by self-certifying plumbers in accordance
        with the Building Act and Public Health Act. Further advice should be sought from:
        * The building Branch of the Department of Infrastructure Planning and Environment
           for proposals located within Building Areas.
        * The Department of Health and Community Services for proposals located outside
          Building Areas.
Tas - In unsewered areas only.
     - Local government Application and approval required before installation and use.
     - The irrigation system must be designed and sized based on site conditions using
         AS1547 and the requirements of the local government. Ask your local government
        Environmental Healtyh Officer for advice about this.


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