Reuse of Grey water depends ...

Reuse of Grey water depends upon. BOD .COD etc. hair,impirities. The hair can be removed with simple strainer. Some treatment is required for reuse like sand filtrationetc.

The relatively clean waste water from baths, sinks, washing machines, and other kitchen appliances.Grey water can be defined as any domestic wastewater produced, excluding sewage. The main difference between grey water and sewage (or black water) is the organic loading. Sewage has a much larger, With proper  treatment grey water  can be put to good use. These uses include  water  for laundry and toilet flushing, and also irrigation of plants.  Treated grey water  can be used to irrigate both food and non food producing plants.

The grey water cannot be used in vegetable garden,if you want to water herbs and vegetables you'll need to get a higher level of water treatment. Untreated grey water should definitely not be used on food that will be eaten raw.

Untreated grey water should only be used for sub-surface garden irrigation — that is, through a network of pipes buried at least 1m below the ground – to reduce the risk of human or animal contact.

Following instruction may be follows-

1. Pipes carrying untreated grey water must display relevant warning labels.
2. You can't store untreated grey water, because the bacteria and other pathogens could multiply to dangerous levels.
3. Use it immediately (or within 24 hours), and if it's raining, divert it to the sewer.
4. If someone in your family is sick with gastro or flu or another contagious disease, stop using the grey water.
5. Don't use grey water if you've been washing  nappies  or using bleaches or dyes.
6. Don't water herbs, vegetables or pot plants with untreated grey water.
7. Your grey water shouldn't escape from your property into a neighboring one, into storm water systems or aquifers used for drinking water — in fact it's illegal.
8. Small amounts of phosphorus can be useful for plants, and it's a major component of fertilizer. When it gets into waterways, however, it can cause excessive algal growth, leading to toxic algal blooms. The effect on your soil is varied depending on your soil type. Clay soils can deal with more phosphorus because the phosphorus binds to clay minerals and doesn't leach away. On sandy soils, excess phosphorus can leach into groundwater. Australian soils are typically low in phosphorus, and some native species can't tolerate high levels.
9. All laundry detergents contain salts, typically sodium salts such as sodium nitrate, sodium sulphate, sodium phosphate and sodium silicate. All laundry detergents are highly saline, and frequent long-term use would likely harm your garden, unless it was spread over a large area.