Essentially, suction comes down to the power of the motor. Dry-only vacuums operate with thru-flow motors, but wet/dry vacuums, as well as extractors and scrubbers, require a bypass motor for wet recovery. A single-stage blower motor is typical for dry vacuums, but larger wet/drys should have a two-stage motor to increase lift and suction. Three-stage motors are common for scrubbers and extractors for maximum lift.
Wet/dry vacuums sold in retail often come with only a one-stage motor, so look for commercial wet/drys with more power, and a two-stage bypass motor. The motor is one of the most expensive components to replace, so also look for a long-term warranty and a top-notch brand track record.
For foamy wet/dry situations, a recent technology advancement saves both time and the hassles of constant foam and water dump-outs. Most wet/drys feature an automatic shut off function when water reaches a certain level that might damage the motor. Foam often triggers this shut off well before the actual water reaches a high level, which can cause constant interruptions. However, a recent innovation tackles the foam problem head-on. This new innovation looks like a metal mesh cage around the filtration system, and serves to break down foam while protecting the motor from damage.
For medium-sized tasks and spaces, a 10-gallon capacity is often ideal. A 10-gallon is versatile enough for big spills, yet compact for easy maneuvering. This size also works well for all the tasks a smaller wet/dry is capable of, plus jobsite cleanup, carpet vacuuming as a canister vacuum, and carpet care.
A 10-gallon vacuum with a convenient tank drain cap allows for fast liquid debris removal. HEPA filtration models are available in this size. This size and functionality works well as a go-to tool for a wide range of spaces and uses, including education, healthcare, hospitality, foodservice, retail, emergency/flood cleanup, hard floor refinishing, construction and lead paint repair and renovation. These vacuums often come with mid- to heavy-grade tools.
