My auto drip pot has been broken for a few years, I just heat the water in a teakettle(after measuring it in the carafe) then pouring thru the filter/grounds.
I have fed flock raiser crumble for 7+ years...with OS in a separate feeder for the active layers(there's always some birds not laying-chicks, molters, cock/erels).
Never had much trouble with leftover 'dust', they eat it up.
Took me a couple iterations to come up with a feeder that deterred...
Have had Light Brahma, before and just got chicks.
They are beautiful, big, mellow, eat a LOT and not great layers.
I sold my last ones as pets, just bought more because I needed chicks 'today' and that's about all there was available.