Troubleshooting odour issues in self made grey water recycling system of a house in Damoh, Madhya Pradesh

I belong to a drought declared district, Damoh in Madhya Pradesh. In order to irrigate plants & water my lawn / garden I have built a water recycling system with the following specifications:


-It is an underground chamber having three sections/ partitions.

-The first section, size 2X3X4(LXBXH)  contians sand and stone pebble(40m), and  an inlet of used water from bathrooms.
-The second section of same size has coal n pebbles both.
-Third section of bigger volume is used to store recycled water.
-Water drained into the inlet section does not include water from kitchen and toilets.

The issue that I am facing is the emanation of an intense foul odor from the chamber. What could be the reason for the same? kindly suggest changes that can help remedy the situation ? If not, kindly provide direction as how to most efficiently implement my plan ?

Atuk Choudhary,
atulnbg@rediffmail.com

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