Grey water systems range from practically free( putting buckets into your shower or kitchen sink) or to the expensive( custom collection systems that divert the water to an outdoor holding bin for filtration and reuse)
These are some cheap ways to recycle water for your garden around the home
1-In the shower, Buckets can be used in the shower, when you have the tap on waiting for the water to warm up, a bucket can collect this cold water to use on your garden.
2- you can easily recycle the water from your kitchen sink by loosening the P trap (the U shaped pipe under the sink) By disconnecting the P trap, your allowing the kitchen water to drain directly into a bucket you place there simply twist the P trap to the side, and make sure you leave some water in there this helps keep the gases at bay from your sewer system. You'll want to empty your bucket on to your lawn or flush it daily.
Grey water to avoid.
Your Grey water should not have any of these materials in it
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Cleaning materials that contain boron
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thinners or solvents bath salts
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bleach
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Drain openers such as Drano
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Artificial water softeners
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Rinse water from greasy or oily things
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Never wash diapers and then use that water for Grey water this is a potential health risk
If you’re using your Grey water in your garden, make sure you don’t allow the Grey water to touch the edible parts of the plants. Using a drip irrigation system is best
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Many dish washing soaps contain phosphates. Phosphates can actually be good for your lawn (adding nutrients to your soil), but if the water leaks into local wetlands or streams, it can be damaging. The best thing to do is to use biodegradable dish soaps.
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Most of your Grey water will need to be filtered in some way, especially if you’re rerouting it to a drip-irrigation line (larger particles in the Grey water can easily clog your irrigation lines). This doesn’t have to be complex, however. Simply use a nylon hose or window screen at the point the water leaves your home into the outdoor system
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Never spray your Grey water; drip irrigation systems are best, as well as using a regular garden house (without a nozzle).
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Don’t store your Grey water more than 24 hours. Storing Grey water allows bacteria to grow, which isn’t good for anyone. So collect it and use it quickly.
The differences between Grey water and black water.
When you wash clothes, clean vegetables, brush your teeth, or take a shower, you are only lightly contaminating the water. This is then considered Grey water, since there is not much wrong with it. This water can easily be reused.
When your washing a cutting board that you just copped meat on or flushing the toilet this is considered black water. The reason is because this water now may be heavily contaminated with bacteria like E.coli salmonella or feces. Grey water is somewhat easy to reuse. Black water, however, is not. Black water should never be recycled it needs to go to a waste water treatment facility to be cleansed.