I believe the biomineral fertilizer Geomite which i developed may break down the fat injurious components of grey water. Arrangements are being made for manufacture in ZA, suggest you contact Floyd Murray at African Bioresources P/L/
Let the water pass through slow sand process and enetr to the empty chamber to allow for treatment of micro organismdeleterious to soil health and thaN can be used for irrigation.S.A.KHAN
Greywater is not really any safer for irrigation than blackwater. It still carries faecal matter and more so if their is illness in the occupants. The high solids content in the water even if filtered prevents successful disinfection. It can be used safely with drip or flood irrigation on tree and vine crops where water does not come in contact with the fruit or nuts. There should be a withholding period of 3-7 days before harvest where no irrigation is carried out.
There are a lot of difference between black water and grey water from pollution point of view in spite of grey water not safe condition but it has less hazard pollution matrix such as stool , worm egg ,bacteria ,virus and .. etc .Its treatment has less complexity than black water .
The cheapest way for reusing of grey water is wetland construction as decentralized local bio remediation for removing of hazard substance in grey water particular in rural and remote area without need to electricity and large utilities.
If it is not a root crop being eaten raw then subsurface drip irrigation reuse can handle most situations and due to the recent droughts is now widely used in California.
I have a close connection with South Africa and in the late 1960's, with Charel van Schoor, was the co-founder of Agriplas. Agriplas has access to our technology through Metzerplas who are licensees of our technology.
Here's a webpage I found helpful regarding the use of greywater for irrigation. Apart from what is mentioned about salts, keep in mind that a frequent water, soil and crop monitoring is crucial when using greywater for irrigation mostly to study the nutrient balance and the required leaching fraction (if any) as well as any possible dilution.