I can vouch for hydroblasting, made my own unit out of a cheap sandblast cabinet and bunnings water pump, sealed up the cabinet and added feed, return, bypass and drain fittings,,, hardest part was sourcing the different fine grades of glass required. Works very well to restore original finish to aluminium and stainless steel etc.
Not a perfect unit, leaks and makes a bit of mess !, and after ~50 hours of blasting the $149 ozito pump is deadish, but it's done what would cost you >$2000 worth of work.
Used 2 x 17cfm compressors linked together for air, but now have big 40cfm compressor that loves it.