My suggestion is to have ...
Published by Engr. Mansoor Ahmed PhD. Scholar, Consultant/Advisor Water/Wastewater Treatment - Consultant
My suggestion is to have your Garden as Vertical Wetland, simple easy Wetland will give a proper look of a Garden too. Instead of going to complicated solutions, Vertical Wetlands are the cheapest and easiest solution for such areas where houses have Gardens/Lawns or ample land available.
On the other hands, if you filter the grey water and disinfect (with Chlorine the cheapest disinfectant) and use it for Flushing the Toilets could be a solution.