Greywater Recycling
Use water twice
to protect the environment
Water from bath, shower and laundry
can be reused instead of sent down the drain
Greywater Greywater Process water
collection tank filtration tank storage tank
ENERGY. HEAT. WATER.
Greywater recycling
GREYWATER YIELD PER PERSON PER DAY
Shower 30 – 50 liters
Bathtub 80 liters
Hand basin 5 – 10 liters
~ 60 LITERS PER PERSON AND DAY
RECYCLED GREYWATER CONSUMPTION
PER PERSON PER DAY
Flushing toilets 20 – 30 liters
Washing machine 10 – 15 liters
Washing/cleaning purposes 5 – 10 liters
Garden watering 100 liters (in the summer)
~ 40 LITERS PER PERSON AND DAY
2 | Greywater-Recycling 2024
USING GREYWATER TO
CONSERVE DRINKING WATER
AND SAVE MONEY
Europeans consume an average of around 120 liters of
precious drinking water every day. Most of this is used for
personal hygiene.
This so-called “greywater”, which can account for around
50 % of all domestic wastewater, then flows into the
sewage system unused. Especially given that climate
change and its consequences in the form of heat waves
and droughts are becoming ever more visible, this is an
enormous waste of our most precious resource!
With a greywater system you are not only doing some-
thing beneficial for the environment, you are also doing
something beneficial for your own wallet. When it is col-
lected and treated for things like flushing toilets, for wash-
ing machines or for watering the garden, drinking water
consumption can be significantly reduced – as can the cost
of both drinking water and sewage fee.
DEHOUST offers the right system technology for your
needs – from the low cost model to the high-tech system
– highly efficient, with high operational reliability and
minimal maintenance costs. Our plants purify greywater
in an environmentally-friendly manner, but also ensure the
water supply for your household in the event of a grey
water shortage. This can also be done digitally, if desired:
With DehoustCONNECT, you or the fitter can easily control
the system using the Internet or an app.
This brochure outlines the most important advantages of
greywater utilization and presents our system models in a
wide range of sizes, for single-family homes as well as resi-
dential complexes, hotels or fitness studios, for example.
Your advantages
} Save water by using it twice
Example
} Short payback periods
GWM 500
} Excellent storage stability
of the process water
} Versatile control system
} Can be combined with rainwater
harvesting
Benefit from DEHOUST’s experience.
We would be happy to help you!
www.dehoust.com |3
Greywater Fact Check
What can greywater be used for?
You can use the treated greywater wherever drinking
water quality is not absolutely necessary! This includes,
for example, flushing toilets, watering gardens or
cleaning work.
How much money can you save with a greywater
system per year?
The reduction in both drinking water costs and waste
water charges means that the investment pays for itself
very quickly.
Who can benefit from such a system?
The systems can be used flexibly and, thanks to their
What is greywater? modular construction, can be designed for any
“Greywater” is fecal-free, low-polluted water that is requirement – from single-family homes to systems
produced, for example, after showering or washing for large properties!
hands. The water quality of the treated greywater We would be happy to support architects and building
conforms with the European standard EN 16941-2 as owners during their planning phases.
well as other common standards such as the British
Standard 8525-1 and the European standard for bathing
What are the constructional requirements?
water 2006/7 / EC.
The greywater sources are connected to a separate waste-
water line. The consumers, for example toilets or garden,
How does greywater recycling work? are supplied by a service water pipe.
The treatment of the slightly polluted water is carried
out in a purely mechanical-biological way. The most
Are there subsudies available?
modern and safest wastewater treatment technology
currently available is used: biomembrane technology YES! A significant number of municipalities offer
(BMT). Once the water has been treated, it is available subsidies for the purchase of a greywater system. Please
again as absolutely clear, odorless and, most importantly, get in touch with your local authorities for more details.
germ-free process water.
Building Certifications also known as
“Green Building”
There are various certification systems available around
the world. Greywater recycling and as well as rainwater
harvesting is an elementary part for every certification
provider.
NEED MORE If you have any questions regarding building certifica-
INFORMATION? tions, contact the respective certification bodies for your
WANT TO SEE MORE? country.
View the video here
4 | Greywater Recycling 2024
Treatment steps and main components
In a multi-stage treatment process, the collected greywater is initially subjected to biological treatment and then the remaining
dirt particles are removed using DEHOUST GWtec® membrane filtration.
Rough filtration Sedimentation
Greywater collected separately is first freed from its Aeration in the filtration tank is controlled to settle particles
undissolved water contaminants including hair and textile lint. and suspended solids prior to ultrafiltration.
Aerobic biological purification Ultrafiltration
All organic contaminants, like shower gel and soap, are The DEHOUST GWtec® membrane filter begins to gently
biologically degraded by special wastewater bacteria in the filter the pre-treated greywater. Ultrafiltration is followed by
aerated greywater tank. a short flushing of the membrane filter with process water.
The control system manages all processes fully automatically
and regulates the cleaning process depending
Overview of filtration spectrums
p
on the level of greywater contamination for the
Kolloide Organ. compounds best possible results.
Polio
Pollen Smallest
S mallllestt
virus
Yeast
micro-
organisms
Storing process water
Dissolved salt
Bacteria Due to its extremely low nutrient content
Vire (biological purification) and the hardly detectable
Hair
Organic molecules residual biomass (ultrafiltration), the treated
Visibility-
threshhold greywater can be stored for extended periods
eyes Ultra filtration
and reused without concerns.
Micro filtration Nano filt
N filtration
Sand-
filtration
Reverse
osmosis
Mains water back-up
100µm 10µm 1µm 0.1µm 0.01µm 0,001µm 0.1nm If no treated service water is available in the
0.1mm 0.01mm 0.001mm 0.0001mm 0.00001mm 0.000001mm
storage tank, the integrated potable water
safely kept out 1nm
replenishment (EN 1717) secures the water
Pore width BMT membrane filter supply.
www.dehoust.com |5
For Single-Family Homes
GREYWATER RECYCLING FOR SINGLE-FAMILY HOMES
The average family uses about 65 % of its drinking water for showering, bathing, washing hands and laundry. Rather than
letting this water disappear unused in the sewage system, use the water a second time for flushing your toilets, washing
laundry, domestic cleaning and watering your garden with a greywater system from Dehoust. Save money and, above all,
drinking water!
With the GWR 300 we offer a simple greywater recycling system for private users, preferably for garden irrigation with a daily
output of up to 300 liters, depending on the quality and the time of occurrence of the greywater.
The GWM 500 is a fully automatic system with integrated drinking water feeding according to DIN EN 1717 and a powerful
submersible pressure pump. The control system is designed for the integration of a rainwater cistern with feeder pump.
All plants with submerged membrane filters and biological pre-treatment for hygienically perfect process water.
More information at dehoust.com (enter article number in search)
GWR 300 GWM 500
Residents 2-4 2-6
Submerged membrane filter yes yes
with aeration
Output volume up to 300 l/d 500 l/d
Puffer volume greywater 200 l 200 l
BW storage 500 l 600 l
Pressure increase optional Submerged pressure
pump including
Drinking water feed optional including
Control no yes
Rainwater integration no possible
Articles 813221 813330 GWR 300
6 | Greywater-Recycling 2024
For medium to larger residential projects
BMT TECHNOLOGY WITH SUBMERGED ULTRAFILTRATION
FOR GREYWATER SYSTEMS UP TO 3,000 LITERS PER DAY WITH THE GWM WATER MANAGER
Would you like it to be a little bit larger? Particularly when it comes to larger properties, greywater utilization offers substantial
potential for savings – both in terms of operating costs and drinking water consumption. Save year after year with Dehoust
greywater utilization and increase the attractiveness of your property with green building technology.
We support you with a solid, fully automatic greywater treatment system for in-house installation, equipped with a coarse filter,
a large-volume greywater storage tank, a compact BMT unit, a service water storage tank with integrated drinking water
separation station, a control unit and a suitable pressure boosting system.
Proven treatment technology since 2009
Key topics at a glance:
} modular concept of the BMT membrane filter tank
} all plant components are transportable by door and
by hand
} environmentally-friendly biomechanical treatment
process
} no chemicals
} fully automatic control unit for regulation and
monitoring of all operating processes
} volt-free alarm output for building management system
} compatible with rainwater harvesting systems
GWM 1150 } proven and safe treatement technology in hundreds of
Dehoust greywatersystems
The GWM control unit also
manages the supply of
rainwater from the cistern with
the feeder pump (article no.
812966)
GWM 3000
Greywater recycling system Residents Treatment output Greywater Process water Article
storage volume storage volume
GWM 950* 20 – 30 950 Liter / day 500 liters 500 liters 813345
GWM 1150 30 – 40 1,150 Liter / day 600 liters 600 liters 813355
GWM 2000 40 – 60 2,000 Liter / day 1.800 liters 1.700 liters 813388
GWM 3000 60 – 80 3,000 Liter / day 2.500 liters 2.700 liters 813398
* Type suitable for technology rooms with low room heights > 2,000 mm;
all other types require room heights > 2,200 mm
www.dehoust.com |7
For residential complexes, sports centers,
hotels, etc.
GREYWATER SYSTEMS UP TO 20,000 LITERS PER DAY WITH DEHOUST GWtec® CONNECT
With our generously-dimensioned greywater systems, starting at a consumption of 3,000 liters per day, for hotels, for example,
your operating and maintenance costs can be substantially reduced – while the level of water quality remains high at the same
time.The plant can be variably adapted to the existing space conditions.
LATEST GENERATION Key topics at a glance:
in the area of greywater recycling } environmentally-friendly treatment procedure without
chemicals
} energy-efficient technology
} dry-mounted hollow fiber membrane filters for fast and easy
maintenance
} dynamic control of treatment performance thanks to
SmartFiltrationControl
} control system with high-resolution 4" touchscreen display
} integrated web interface provides real-time access to all plant
processes via smartphone, tablet and PC
} compatible with rainwater harvesting systems
Standard equipment:
DEHOUST GWtec® ControlUnit, DEHOUST GWtec® membrane
filter, filtrate pump, level transmitter, flow meter, switching
Greywater system DEHOUST GWtec® 240
valves, greywater filtration tank and aeration unit
DEHOUST Grey Water recycling system *Residents **Treatment output Weight kg Article
m³/day
DEHOUST GWtec® 140 W up to 100 3–5 130 813371
DEHOUST GWtec® 240 W 200 10 190 813372
DEHOUST GWtec® 340 W 300 15 260 813373
DEHOUST GWtec® 440 W 400 20 330 813374
* determined with operating water consumption 50 liters/resident and day (e.g. for flushing toilets, cleaning,...).
** net treatment capacity including membrane filter backwash; treatment capacity dependent on operating settings and
greywater contamination.
8 | Greywater-Recycling 2024
DEHOUST GWtec® Membrane Technology
All of the data communication is safeguarded against unauthorized access and only runs on the company’s own
DehoustCONNECT server.
Remote servicing is enabled by using a secure SSH connection. Any further device communication with the
DehoustCONNECT cloud is based on encrypted connections on port 1883 and 8883. No port forwarding needed.
The DehoustCONNECT control unit’s integrated web
interface provides a wide range of remote operation
options:
} reviewing and modification of operating parameters to
optimize performance
} live monitoring of operating processes and data
} error analysis and correction via remote access
} sending alarm and status messages via e-mail
} automatic software updates
Data output in MODBUS or BACnet
}
Example GWtec® 440. Storage volume depends on system.
www.dehoust.com |9
Supplementary components ...
Coarse filter DEHOUST MAX I
with DN 100 ports including backwashing
control via DEHOUST GWtec® unit
Article 812651
Coarse filter DEHOUST MAX II
with DN 150 ports including backwashing
control via DEHOUST GWtec® unit
Article 812657
Greywater collection tank 1,500 – 4,000 liters
with inlet DN 100/500 and overflow nozzle DN 100/150
control via DEHOUST GWtec® unit
Article 962051 – 1,500/1,350 liter volume
Article 962053 – 2,000/1,800 liter volume
Article 962055 – 2,500/2,300 liter volume
Article 962057 – 3,000/2,800 liter volume
Article 962059 – 4,000/3,750 liter volume
Process water storage including drinking water storage
In accordance with DIN EN 1717 with overflow nozzle DN 100/150
control via DEHOUST GWtec® unit
Article 962050 – 1,500/1,250 liter volume
Article 962052 – 2,000/1,650 liter volume
Article 962054 – 2,500/2,050 liter volume
Article 962056 – 3,000/2,450 liter volume
Article 962058 – 4,000/3,100 liter volume
additional tanks:
10 | Greywater-Recycling 2024
... for DEHOUST GWtec® technology
Aeration unit
} Aeration unit for greywater collection tank
} Article 813440
Greywater batch pump
} Greywater batch pump DOC 3
} Volume rate: max. 8.7 m³ / h
} Delivery height: max. 7 m
} Article 813443
} Greywater batch pump DOC 7
} Volume rate: max. 13.8 m³ / h
} Delivery height: max. 11 m
} Article 813444
Automatic drainage system for process water storage
} Automatic drainage system for process water storage
} Article 813456
Rainwater harvesting package
} DEHOUST GWtec® rainwater feeder pump for automatic
replenishment of rainwater to the process water storage tank
including fill level indicator rainwater cistern
} Article 813475
All supplementary components are supplied and controlled through the DEHOUST GWtec® Station
www.dehoust.com | 11
Heat.
Energy. Water.
STORING AND USING ENERGY
The main factory and headquarter of
DEHOUST GmbH is in Leimen near
Heidelberg. The processing of high
density polyethylene on large blow
molding machines is one of the core
competencies of this plant.
The production of CONNECT Booster
stations, CAT 5 break tanks and
greywater treatment plants GWtec®
is also concentrated in Leimen.
Our product range in plastic storage tanks:
Plastic tanks BE Kombi
1100-4000 DF double wall
with DIBT tank 720
and 1000
EN 13341
Double walled Water tank
TrioSafe
750-1500 AQF 570-1500
Innertank
EN 13341
6810/2024_04_EN
Dehoust GmbH I Gutenbergstraße 5-7 I 69181 Leimen I Germany I info@dehoust.com www.dehoust.com
