You must check with your local council before installing any grey water system that irrigates your land,
The Big problem we all overlook with grey water is spreading disease, I personally would not use greywater anywhere near veggies.
The authorities biggest concern is some one infecting there neighbors, In south Australia at the moment there is a rebate for installing rainwater tanks,
If possible I would be investing in a rainwater tank and use grey water as a last option, Each state has diffrent laws, re grey water, One good use is use your grey water to flush your toilets, but remember grey water must be dumped after 24 hours to prevent bacterial growth
"Don't worry, It only seams Kinky the first Time"