Oct 122019
Grey Water System – An Essential Guide

Do you know about grey water? It is gently used water from your showers, bathroom sinks, washing machines, and tubs.

Greywater does not come in contact with feces from the toilet and/or washing diapers.

However, it may contain traces of grease, hair, food, dirt, and certain household cleaning products.

It has been estimated that over half of household water used can be recycled as greywater. Potentially, this could save hundreds of liters of water on a daily basis.

Component of a Grey Water System

There are two ways to create a grey water system that recycles your water.

The first one is diversion devices that simply carry Greywater from your washing machine or bathroom directly to your toilet or garden, without treating it.

The components are:



A simple flexible hose is used to divert greywater from its source to the garden.


Diverter Valves

The price of a diverter valve is around $30-40. When you install it and it allows for choosing when the water flows to the sewer and when it flows to your garden.


Closed-loop System

It is used for the diversion of grey water to your toilet. It does not allow the water to flow to your garden.

Some states in the U.S have not issued legal approval for using the closed-loop system yet, however, these policies are frequently changing so I would recommend looking into your state regulations.



Surge Tank

The tank is used for storing the brunt of the outflow. This way, the grey water would not flood the garden.


It is important to remove the sludge from the surge tank after 5-6 months.

In addition, it should have an overflow device so that the excess water is diverted into the sewer.



They are an essential component of the diversion device, which is used to remove hair and other particles from the water. The purpose is to avoid clogging in the irrigation pipes.


Remember, filters need regular maintenance and cleaning. It is recommended that you replace the filter on a regular basis, I would suggest every 6 to 12 months.



Water Pump

A water pump is essentially useful and necessary for getting water to all parts of the garden – particularly if gravity is not on your side.

However, there are several designs for this and some that involve no electricity too.


You may also need a power source – meaning thereby that you need to get an outdoor powerpoint installed.


Grey Water Treatment Systems

The second way to recycle greywater is through the treatment system. This system collects and treats the water to different levels of hygiene and purity.


The different stages involved in the treatment of water are:

1. Solid filtration that involves hair and lint removal.

2. Removal of unwanted chemicals and pathogens such as bacteria, viruses, salts, and nutrients. This is either done through chemical treatment or with micro-organisms.

3. Disinfection by UV light or chlorination.



What is Next?

After treating water with the treatment system, you can use the water in toilets and washing machines. You can also use the water in your garden.


Moreover, if you do not have much garden to water and/or if you are not in need of water your garden in all seasons, still, this sort of treatment system is useful as you can use the treated water elsewhere.


How Much Will it Cost?

A basic treatment system would cost you around $3500.

If you want the “Class A” greywater treatment system, which is safe for treating the water to be used for watering plants that are intended for eating (however, not for drinking) will cost you around $10,000 to $15,000 – this also includes the cost of installation!



A Few Final Thoughts

If you ever need a helping hand or have any questions on this product or want to leave a comment or a review of your own, please do so in the space provided below.

I will be more than happy to answer them as best to my knowledge and would enjoy hearing from you.

If you want to join me on this journey, please use the social links below or subscribe to my newsletter on the right-hand side of this page.

All the best,




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Reader Comments

  1. Love your Post! I’ve been interested in Grey-Water Systems ever since learning about Earthships, and learning how to use re-use water rather than all water going into a septic tank. Not all water is “Black-Water”, and is safe to re-use for areas such as watering the lawn/garden, etc…

    Keep up the good work!

  2. Imagine the difference it could you make if more houses around the world started to use this! Great information here on grey water recycling, it’s definitely something that should be researched more into and implemented where possible, including houses and public areas (some places do this already already).

    Personally, I believe that those in the situation to be able to invest in this are very fortunate and have a great opportunity. Since there are so many methods, it’s possible to be creative and adapt the system to one’s own purposes!

    Thank you for sharing,

    1. Hello James,
      You are right, there are some public places that do this already, for example, the Grand Canyon. However, this is done out of necessity. I too would like to see more people, businesses, and environments adopting these systems out of choice.

      I agree with you about how much flexibility there is in designing such systems, you really can make them work everywhere.

      You are welcome James and I hope you have a great day!

  3. Hi, I really liked your post, but I have a question:
    Is it possible to do a DIY filter for my house??? I would really like to do one so that I can use it to clean the grey water.
    I love how you care about the world! Hope to hear from you soon!

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