01
Toilet flushing
Supply through a separate non-potable network after suitable treatment and disinfection.
WATER REUSE
Greywater
Give everyday water a second use. With proper collection, treatment and monitoring, some bathroom wastewater can be reused for non-potable purposes.
WHAT IS GREYWATER?Water that does not need
Water that does not need
to be lost after its first use.
Greywater is wastewater from showers, bathtubs and bathroom sinks. It differs from toilet ‘blackwater’, which is not collected in the same system.
Kitchen wastewater is usually excluded from light-greywater systems because of fats and food residues. Laundry water is assessed separately, based on detergents and treatment technology.
- Reduce drinking-water demand for suitable secondary uses.
- Make use of an available resource within the same building.
- Design based on wastewater supply and actual demand.
Greywater cannot be reused directly. It requires assessment, appropriate treatment and compliance with applicable health and environmental requirements.
WHERE GREYWATER CAN BE REUSEDThe right use,
The right use,
under the right conditions.
Treated-water quality must meet the requirements of its intended use. Not every application is suitable for every installation.
02
Landscape irrigation
Water selected plantings where water quality, irrigation method and applicable requirements allow.
03
Hotels & homes
Assessment for buildings with consistent wastewater from showers and sinks, especially where separate collection is included in the design.
04
Controlled operation
Quality monitoring, maintenance and safe backup supply, without cross-connection to the drinking-water network.
FROM COLLECTION TO REUSE
One system. Four key stages.
01 /
Separate collection
Separate pipes collect suitable wastewater. Mixing with toilet waste is excluded.
02 /
Appropriate treatment
Pre-filtration followed by biological or membrane treatment, depending on the load. A simple filter is not enough.
03 /
Disinfection & monitoring
The selected disinfection method is combined with controlled storage and quality checks to reduce risks.
04 /
Safe distribution
A separate, labelled non-potable network with backflow protection and regular maintenance.
OWNER’S GUIDEA guide,
A guide,
ready to print.
Key requirements, maintenance tips and questions to ask before installation. Print this guide for your discussion with an engineer.
GTgreen Eco Solutions — Greywater: Owner’s guide26431 20251 · gtgreen01@gmail.com · Vonitsa, Aetolia-Acarnania
Key requirements
- Separate collection pipes with no connection to toilet wastewater.
- Adequate space for a storage tank and treatment equipment.
- Separate, labelled non-potable network, with no connection to the drinking-water supply.
- Access for maintenance and water-quality checks.
- Compliance with applicable health requirements and local permits.
Maintenance that matters
- Scheduled inspection and replacement of filters and consumables.
- Periodic disinfection and quality testing of stored water.
- Clean storage tanks according to the operating schedule.
- Inspect safety valves and backflow protection.
- Keep a maintenance log with dates, measurements and observations.
Questions before installation
- How much wastewater does the building produce, and what is the actual demand?
- Which uses will the non-potable network supply?
- What is the total cost of installation, energy and maintenance?
- Who will carry out maintenance and checks?
- What do local health regulations require for this use?
FREQUENTLY ASKED QUESTIONSBefore taking
Before taking
the next step.
The GTgreen team can assess your property and discuss whether a water-reuse solution is feasible.
Talk to usBetter water starts here.
Tell us about your property. Let’s find the right solution, together.