The woman was seen lowering the bottle into a reverse vending machine while watching the display clock up her earnings as she pulled the bottle back and forth.
Police said the woman was accompanied by her 11-year-old son, who she put to work shoplifting in the store while she, not for the first time, tried to cheat the bottle deposit system.
“This time it only came to about 100 kronor but the methods used mean we are classifying it as fraud,” police spokesman Per Vikman told Expressen.
The woman was detained at Köping police station and social services were called in to take care of the boy.