Remove the Accumulated Garnet
Since garnet abrasive and metal particles continually accumulate in the tank, regularly scheduled removal of accumulated deposits is necessary. When removing garnet abrasive material from the bottom of the tank, it is best to completely drain the water from the tank before attempting to remove the garnet abrasive waste. The drier the garnet abrasive, the easier it is to remove.
Used garnet abrasive by itself is not toxic and can be taken to a dump site or disposed of normally. However, if any hazardous materials were cut, the garnet abrasive waste becomes subject to several environmental regulations. Contact the local officials for proper disposal methods.