Sunday, 24 June 2007

Setting up a grey water system on the cheap

Post note: After using this system for about a month now, we realised we hadn't added a lint catcher of filter, so have stretched a piece of flywire across the top, held on with the lid. Simon also drilled out the small filter on the tap itself, which allows for greater flow-through of water.

Canberra is switching to stage 4 water restrictions sometime in July/August, which means NO outdoor watering (i.e. using potable water). ActewAGL also have a waste water treatment program to help manage our decreasing potable water levels.

We love our garden, like many other Canberrans, and while we generally use our washing (grey) water, sometimes when we wash we don't need to water the garden then and there (particularly now in the winter months). According to ACT Health, an average household can generate up to 528 litres of grey water everyday - crikey! Makes you want to reuse it, just to make it really worth it! :o) So, reusing our washing water (approx 120 litres a wash) is a pretty good start!

So today, we put together a cheap grey water system, made up of a 75 litre garbage bin (we have a small-ish washer), with a clip-on lid, outlet, garden tap and 13mm hose. We didn't want to spend up big on a complete system (being fairly recent home owners and all!), and wanted something that could collect washing water, yet allow us to water at another time as the garden needed it. We have an existing hose running from the machine out to the garden which we move about to soak plants.

The system goes together like this:

1. The hose runs from the washing machine outlet hose to the top of the "tank" (75 litre garbage bin).

2. A hole in the top (i.e. bin lid) allows any air to escape as the "tank" fills. The hose is set at top of the "tank", to avoid any siphon-effect, so that water does not get sucked back into the machine.

3. An outlet with a tap is fitted at the base of the "tank", to allow water to be used (via a gravity-feed method) when required. This will hopefully take the pressure of the washing machine pump too (fingers crossed).
**Note: ACT Health guidelines on using grey water strongly recommend you dispose of unused grey water after 24 hours via your sewage system - you need approval to store grey water any longer than 24 hours (it's a good read actually, states how to set up and manage your grey water use and explains the affects possible of grey water on your garden too).

We have set the system up just above our sewage drain outlet and can run unused water directly into the sewage system when necessary.

4. To use the grey water, we can either attach a hose that runs out into the garden, or use a watering can, depending on what requires a little watery lovin'! The good thing is that the system is pretty much a closed one, making it relatively safe (in terms of storing it at least).

Here's a quick slideshow of the parts that came together to make our cheap grey water system.

When I say the system is "cheap", the whole lot cost less than $A40. We had existing hose (about 15 metres or so) and used some silicon to seal the outlet at the base of the bin. All parts were found from our local hardware store too. It took less than an hour to set up the system itself and we will allow 48 hours for the silicon to set (especially so it doesn't contaminate the water and thus our lovely vegies and plants!). We could get a bigger bin, but given the time limit on storing grey water, it's likely 75 litres would suffice.

Eventually, we would love to have a fully integrated grey water system, where we could reuse the water for flushing toilets, as well as for watering the garden. This, combined with a rain water tank, would really reduce our water usage!

We'd love to hear how you're coping with water shortages and restrictions - what projects have you done to conserve water in your home? What do you think of our "cheap" grey water system?


Beck Middleton said...

An excellent post and just what I was looking for. I live in Spain and am in the process of buying an property which I want to make as eco friendly as possible. I've been trying to figure out a simple grey water system which I can convince my other half to set up for me, and this looks doable.
Cheers, Beck

BodyMindfull said...

Thanks Beck, glad you found it useful! I'll be following your blog about living in Spain too - looks interesting (was just reading your toothpaste recipe in fact)... (but don't think I'd be able to convince my other half to do that kind of move!) :oP