part of effective compost management is turning the compost. i do this a several times a year with one of those claw gadgets - this too will encourage the ants to move along and find a new residence. since my 4X4 bin rotted out, i picked up those plastic black urban types, nothing gets into them, i checked them yesterday and everything is still frozen inside, so i dumped in a load of snow and covered them back up - daylight sun with melt the snow and help with thaw. even frozen, i toss in scraps all winter long. that brings up another point, perhaps your internal compost temperatures are not getting hot enough for optimal organic matter breakdown.
in larger composts,they use pitch forks..... remember growing up and always seeing pitch forks? whether it was on "green acres", a "three stooges" episode or even in your father/grandfather's tool shed, pitch forks were everywhere. let's bring back the pitch fork.
good composting.
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