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- What works best to loosen soil – high pressure water or air?
 In porous, hard or rocky soils, air is preferred for several reasons. When air is blown under pressure into the soil, it penetrates the soil and expands to explode the soil from below, rather than chipping the soil from above. Air promotes a faster dig than water because it creates dry spoils that can be used for backfill. This means there are no muddy spoils to be hauled away or additional outside backfill needed. Air is a gas and is more easily compressed than water making it the safer alternative on the job site.
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