Dear Lehogonolo, It ...

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Dear Lehogonolo,

It depends!  

Source of greywater.

Treatment of greywater.

Crop being irrigated. 

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.

See www.californiawaterreuse.org.  and the bottom section of  http://www.geoflow.com/Library/libraryag.html 

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.

Regards,

Rodney