How to Vacuum Inground Pool | Deep Clean Steps

That dirty bottom isn’t going to clean itself, and the wrong technique can leave you stirring debris instead of removing it. Whether you’re dealing with leaves, sand, or algae sediment, the process is straightforward once you understand the few mistakes that send most people back to the deep end. This guide walks the exact sequence—from assembly through post-vacuum storage—so you’re done in one pass, not three.

Gear You Need Before You Start

Missing one piece means walking back to the shed mid-job. Gather everything first:

• Telescopic aluminum pole (length depends on pool depth)
• Standard vacuum head (brush type for concrete/plaster; softer for vinyl or fiberglass)
• Vacuum hose, typically 1.5-inch diameter
• Vacuum plate (also called a skimmer plate) or the skimmer basket adaptor your system uses

Optional but smart: a leaf canister for heavy debris so it never reaches the filter. If you’re tired of wrangling hoses with a cord, our cordless pool vacuum recommendations can skip much of this manual setup.

Pre-Vacuum Prep That Saves Time

Skim the entire surface twice—leaves floating now will sink later. Brush the walls and floor to loosen settled dirt and algae. Check filter pressure: if it’s more than 8–10 psi above clean baseline, backwash first. A clogged filter starves suction before you start.

For variable-speed pumps, set to high speed. Shut off pool features like waterfalls or fountains that steal suction. If your system has a three-way valve, close the main drain so suction pulls only from the skimmer. If the pump starts drawing air with the valve fully shut, open the main drain halfway.

Priming and Connection: The Step Beginners Botch

Inserting a dry hose into the skimmer is the fastest way to lose prime and potentially damage the pump. Submerge the hose fully in the pool until every bubble escapes—you’ll see the water stream stop sputtering. Keep one end submerged while you connect the other.

Assemble the pole and vacuum head, then connect one hose end. While the hose is still completely underwater, connect the other end to the skimmer using the vacuum plate. The plate blocks the skimmer basket opening so suction pulls only through the hose. If your skimmer uses a direct hose-lock system, push it in until it clicks.

Turn on the pump and watch for steady water flow out of the returns. If you see air bubbles at the pump lid or returns, you’ve got a leak—reseat the hose connections.

Filter Setting: Know When to Use Waste

Set the multiport valve based on what you’re pulling up:

• Filter for light debris (dirt, fine sand)—water returns to the pool, filter catches the junk.
• Waste for heavy debris (algae clumps, leaves, after shock treatment)—water bypasses the filter entirely and exits through the waste line. You will need to add fresh water afterward because the pool level drops.

When vacuuming to waste, watch the water level. Running the pump dry even briefly can burn out the seal. Shut off the pump the moment the skimmer starts sucking air.

Vacuum Technique That Pulls, Not Pushes

Start at the shallow end, working toward the deep end in long, slow overlapping strokes—each pass should overlap the previous one by about half the head width. Move at a walking pace; rushing kicks dirt off the bottom back into suspension. If the head sticks to the floor, turn the pump off for one second—the release is instant.

If the water turns cloudy during vacuuming, stop and let it settle for two hours before resuming. Vacuuming cloudy water only re-circulates the particles.

Post-Vacuum Procedure

Turn off the pump before removing the hose. Lift the hose to the center of the pool—this lets the pump draw remaining debris out before you disconnect. Then remove the hose, drain water back into the pool, and brush walls and steps one final time. Clear the pump strainer basket. If you vacuumed to waste or have a sand/DE filter, backwash now. Rinse all parts with fresh water, dry them, and store in a shaded dry area.

FAQs

Why does my vacuum head keep floating off the bottom?
The head is likely too light or the pump speed is too low. Use a weighted vacuum head or increase pump speed. Also check that no air is trapped in the hose—re-prime if needed.

Can I vacuum an inground pool without a vacuum plate?
Yes, if your skimmer has a direct hose-lock port. Otherwise, the vacuum plate is necessary to create suction. Foam skimmer blockers can work as a temporary substitute but may not seal as tightly.

How often should I backwash after vacuuming?
Backwash after every vacuum to waste cycle. For standard filter-mode vacuuming, backwash when the pressure gauge reads 8–10 psi above clean baseline—not necessarily every time you vacuum.