... working 6-8 hours.3. Processing good quality, use this kind shot blasting machine, the processing quality can ... No need to pay a heavy physical labor. 6. Use less sand, traditional method need more than 20T sands, ... 0.7T sand, and can be recycle. 7. The one-time investment is small, only about 30% -40% of ... it total power is 49kw, need two worker, and one 28m section tower can be finished within 3 hours, ...