Vacuum manufacturers like to boast about the strength of their machines by promoting horsepower and amperage. On their own, the engine’s power and the electrical current required frankly are almost irrelevant. We believe what is more important their to focus on suction and airflow. Good machines are geared toward performance on at least one of these metrics, depending on their intended usage.
Suction is measured by inches of waterlift, or the height a vacuum motor can lift a column of water of one inch diameter. For addressing liquid clean-ups it is best to use a machine with strong suction (such as 150”).
The other measure, airflow, tracks the number of cubic feet per minute (CFM) the machine is able to inhale within one minute. A vacuum with a high airflow (such as 156 CFM) is well-suited for removing dry soil.