Gardaí in west Sligo seized four gallons of saleable poteen and 14 gallons of wash when they raided a property in the Culleens area last week.
The haul was enough to make 64 gallons of the illicit spirit.
Officers dismantled and destroyed the still, which was producing poteen at the time the raid took place at about 9.30pm.
Most of the poteen, apart from a sample needed for evidence, and the wash were disposed of.
The search by gardaí of a number of sheds is believed to have followed a tip-off.
Four gallons of poteen, ready for sale to potential customers, were discovered in containers.
The size of the operation surprised gardaí as it was believed that poteen, or "moonshine" production, in rural Ireland had died out because of the boom in the economy and the availability in pubs, supermarkets and off-licences of more glamorous, legal alternatives.
"Obviously, there are still a few production pockets in isolated rural areas and possibly even in urban estates," a Garda spokesman commented.