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The answer is to limit and/or control ventilation. You want to make sure that there is little to no ventilation of the odours/gazes into the space (tent/hut/...) where humans are using the toilet. This might be more or less practical depending on your specific setup, or rather how sophisticated your "hole in the ground" actually is. What I have ...


Your chief problem seems to be: with tens of flies trying to fly into your nose, mouth, and eyes Why not a mosquito head net? It's safe, re-usable, portable, and non-lethal! Like the old saying goes: "If you can't beat them, let them join you!" err, or something like that... Source


If possible, try to make a "dry toilet" use of the facility you've to deal with. Dry toilet means that excrement will not be leaved exposed to the air but have to be covered with some carbon-rich organic material like saw dust, fine triturated hay or straw, dried leaves, or what so ever (triturated newspaper or what ever sort of paper/carton), if ...


We simply used builders lime (Ca(OH)2) (calcium hydroxide) powder after every toilette use to cover everything up. But be careful with that, it's not a toy and can serious harm humans


One method is to provide a screened light-pipe as ventilator, and use an unlit room. Flies fly down into the 'hole in the ground', then up the ventilation pipe to the light. They accumulate in the ventilation pipe, blocked from exit by the screen. Deep-drop toilets often do not have a ventilation pipe, and are sometimes open to the sky at foot level, or just ...


The following is based on experience building toilets for places of worship in rural Africa: Keep the toilet room dark. Without light inside the toilet room (tent/hut etc.), the flies are attracted out from below in the pit via other routes to the outside, not into the toilet room, e.g. via a ventilation gap in the cover above the pit, but outside the room. ...

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