Set the vacuum up for wet pickup before you turn it on. That means checking the filter instructions for your exact model, removing any dry collection bag and making sure the drum and drain are ready for liquid.
1. Remove the dry collection bag
A disposable dust bag is for dry debris. Do not turn it into a soggy liner.
2. Follow your model’s filter instructions
RIDGID currently recommends a cartridge filter for wet/dry pickups and offers the VF7000 wet filter for high-volume liquid cleanup with debris on many 5-gallon-and-larger models. Other brands and models can differ.
Read the filter explanation if you were told to simply remove every filter.
3. Use a wet nozzle when it helps
RIDGID lists a dedicated wet nozzle among the WD1450 accessories. A wide floor nozzle designed for liquid can make puddles much faster to collect than a narrow utility nozzle.
4. Pay attention when suction suddenly stops
The float inside a wet/dry vac is designed to rise as the drum fills and protect the motor from liquid. When it closes the airflow path, the sound changes and useful suction drops. Turn the vac off and empty the drum.
5. Empty, rinse and dry the machine after the mess
Dirty water left sitting in a plastic drum becomes its own project. Drain the liquid, clean the drum as appropriate and let wet components dry before switching back to dry dust collection.
Ordinary wet/dry vacs are not a safe answer for gasoline, solvents, flammable liquids or unknown hazardous material.
Before the first puddle
Check that the drain cap is tight, the drum is empty and the wet-pickup filter setup is correct. A vacuum half full of sawdust is not ready to become a water collector.
Work from the shallow edge
On a large puddle, start where the water is shallow and move toward the deeper area. That gives you better control and lets you hear the vacuum’s sound change as the drum fills.
Empty before the drum is impossibly heavy
Water weighs a little over eight pounds per gallon. A large shop vac does not need to be completely full before it becomes awkward to move. Use the drain when the model has one and the location allows safe disposal.
After wet pickup
Rinse mud and debris from the drum as appropriate, clean the wet nozzle, and let the filter and interior dry. The goal is to avoid turning the vacuum into a damp storage bin between jobs.
Sources used for this answer
Back to class: Wet/Dry Vac Class.