Shop vac water question

This is easy. Put a 55 gallon drum between the shop vac and the suction hose. Then you'll fill the drum first.
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We use this configuration at work to suck desiccant out of air dryers. One of them holds 750 pounds, so it sucks when you gotta keep stopping to empty the shop vac. Speeds up the process too so we can get more *** time.