The potential market for pumping is still growing and it will grow to the extent that good quality work can be done and good service provided. The record that the pumper can make with regard to effective and reliable pumping, and the quality of his relationships with testing laboratories, materials suppliers, and concrete contractors will do more for him than an army of salespeople and a bundle of advertisements. One, use pumpable mixes. A key factor in a successful pump operation is knowing what mixes can be pumped. The contractor is not likely to mind if you tell him that his mix won't pump unless he adjusts it, but he will object strenuously if you get on the job and can't handle the fresh concrete. The pumping contractor can acquire the necessary knowledge about the pumpability of different mixes through job experience and close cooperation with testing laboratories. Second, know your aggregate. Some areas of the country are fortunate in having excellent aggregates for pumping. Aggregates should be hard and well graded. It is usually advantageous if they, like river gravels, are rounded but a well-graded crushed aggregate such as limestone normally pumps without difficulty. Third, practice good scheduling. All scheduling of operations should be done through the office and none by operators in the field. Information of the kind called for in the job work order should be entered right away. Customers should be encouraged to give as much notice as possible when calling for a job so that it will be convenient for the pumper to study the job ahead of time. Fourth, know your equipment. The eventuality that will be most discouraging to a customers is to have concrete on the job with men waiting to handle and place it only to find that the pumping contractor cannot move it. For best customer relations, therefore, the pumping contractor must not only be thoroughly familiar with the materials to be used and with the pump that is on the job but he also must do everything possible to prevent equipment breakdowns. Ideally, he will confine his operation to a sufficiently restricted geographical area that he can bring every piece of equipment back to the yard every night. Each pump should be checked by a competent mechanic at the yard before it goes back to the job. And fifth, save a million miles. A two way radio is indispensable. It is needed by the office to obtain information about job progress, make schedule changes or contact the customer's foreman.