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That thing is brilliant! Might build one myself. Yes, husbands can be useful, eh? I'd put it well away from the coops so the flies are attracted to it, rather than near the coops (if possible). And there are a lot of flies in that thing.
After I started doing this there was a noticeable drop in fly activity or it was all on or in the bottle. I also put them up during the "Blowfly Season" as we call it here, to minimise blowfly strike on my sheep. Seems to help.
I just like the bottle idea because it takes me 5 mins to make, a little longer to decide on what smelly thing to put in the water. When "full", throw it in the bin and put up another one (I hang them in the coops or on a tree nearby). With some I have set up, nothing went in them, obviously what I had put in the water was not a strong enough attractant. I thought the water is essential tho I suppose it could work without it....bit of dog food maybe or a small piece of offcut meat. Without the water you will get maggots, with the bottle (and water) idea they drown.
On second thought, the problem with the larger version is that you either have to clean it out at some stage or dispose of the whole thing.