Pravin, I am a newbie as well but I don't think that aquaponics is suitable for grey water treatment. Aquaponics is a closed system as far as water is concerned. What you need is a biofilter, which is only a part of an aquaponic system... You can find informations in the forum on biofiltration, have a look ...
Thanks for joining the Aquaponic Gardening community! I hope you find it a fun place to explore aquaponics. There is a real blend of experienced and new aquapons in this community, so please don’t hesitate to get in there and start asking questions. Everyone is quite happy to help out new members – no question is too basic.
A great place to start is to read the “How to Use This Site” link on the upper right corner, “Start Here” section of the Home page. You might also find the “Aquaponic Gardening Rules of Thumb” guidelines helpful.
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Thanks again for joining us, and I look forward to getting to know you.