... /h Working productivity:20-22m3/h high output 25m3/h JS500 portable concrete mixer Put water,cement,sand and stones at the rate ... concrete mixer,operate the mixer,run 60 seconds or so(it is suitable for JS500),then stop,The concrete is then ready for pipe making.1 ... )etc welcome you contact me~~~~ 3,Our equipments in Sebria JS500 concrete mixer machine