an apparatus and system for producing a gel for the treatment of petroleum wells are disclosed herein . the apparatus comprises : a mixing fluid stream , the mixing fluid stream comprising : a mixing fluid inlet for accepting a mixing fluid ; a first pump ; a dry polymer inlet for accepting a dry polymer ; a hydraulic mixer configured and adapted to mix the dry polymer with the mixing fluid to produce a concentrated gel ; a dilution fluid stream for diluting the concentrated gel to produce a diluted gel , the dilution fluid stream comprising : a dilution fluid inlet for accepting a dilution fluid ; a second pump ; and an outlet coupled to the mixing fluid stream .