Ultimate Washer Wet Sandblast Kit, 4000 PSI, 10 GPM

Minimum requirement for GPM was not listed. Only when I got the item and read over the manual that this wet blaster requires a minimum 4 GPM. My pressure washer in only rated up to 2.8 GPM. Now I can't use this as the results most likely will be disappointing...delaying the time it will take me to even start the project I want to use it for!