First you need to get a filter crusher. These filter crushers remove more than 95% of the residual oil from the filter and make disposal much safer for the environment.
To crush a used oil filter, you simply place one filter in the crushing chamber with the open end of the filter facing downward within the area surrounded by the six centering posts. Then you close the door to activate the crushing cycle. When the unit stops running or runs noticeably slower, the crushing cycle is complete (NOTE: the crusher will not operate with the door open). Raise the door and carefully remove the crushed filter.