Guide
How Do Robotic Pool Cleaners Work? A Plain-English Guide
A robotic pool cleaner is a small, self-contained vacuum: motors drive it, a pump pulls water through its own filter, brushes loosen dirt and sensors guide it. Here's how each part works.
In short
A robot pumps pool water through its own filter while drive motors move it across the floor and up the walls. Power comes from a battery or a low-voltage cable, and sensors or cameras decide where it goes. It doesn't use your pool pump or filter at all.
A robotic pool cleaner is essentially a small underwater vacuum that runs itself. It doesn't connect to your pool's pump or filter. Everything it needs is built in. Here's how the main parts work together, based on how the makers describe their designs.
The main parts
| Part | What it does |
|---|---|
| Pump (impeller) | Pulls water in through the bottom and pushes it out the top, carrying dirt into the filter |
| Filter | Basket, cartridge or bag that traps debris; fine filters catch particles down to about 3 µm |
| Drive motors | Turn the tracks or wheels to move, turn and climb |
| Brushes or rollers | Loosen dirt and algae so the pump can lift it |
| Power | A lithium-ion battery (cordless) or low-voltage power from a supply beside the pool (corded) |
| Navigation | Gyroscope, ultrasonic, time-of-flight sensors or cameras that decide the route |
How it moves and climbs
Drive motors turn rubber tracks or wheels. To climb a wall, the robot relies on its pump: water pulled in underneath holds it against the surface while the tracks push it up. That's why a full filter makes robots stop climbing: less water flows, so they lose grip. See not climbing walls.
How it cleans
Brushes scrub the surface, and the pump draws loosened dirt into the filter. Because debris stays in the robot, your pool filter stays cleaner. You empty the robot's basket after each cycle.
How it's powered
- Cordless robots run on a lithium-ion battery, typically for 1.5 to 5 hours, then recharge out of the water.
- Corded robots get low-voltage power through a floating cable from a power supply on the deck, so they run as long as needed.
Our cordless vs corded guide compares them.
How it navigates
- Basic: drives until it meets a wall, then turns.
- Planned paths: gyroscopes and motion sensors keep straight, overlapping lines.
- Obstacle sensors: ultrasonic or time-of-flight sensors detect walls, steps and drains (Beatbot's Sora series, Aiper's X series).
- Cameras: a few robots, such as the Aiper Scuba V3, use a camera to spot dirt and head for it.
Why it can't be controlled underwater
Wi-Fi and Bluetooth signals barely travel through water, so apps usually only reach the robot when it's at the surface. Some brands sell floating relays to fix this.
Not sure which robot fits your pool?
Answer five quick questions and see the models that match your pool type, size and budget.
Frequently asked questions
Does a robotic pool cleaner use my pool pump?
How does a pool robot climb walls?
How do pool robots know where to go?
Sources
Specs, prices and claims in this article come from these sources.
- How do robotic pool cleaners work? A complete guide to cordless technology · Aiper · accessed Oct 16, 2026
- How do pool robot cleaners work · Beatbot · accessed Oct 16, 2026
- How do robotic pool cleaners work? · iGarden · accessed Oct 16, 2026
Written by
Research and editing
The PoolRobots editorial team researches robotic pool cleaners from manufacturer documents, published measurements and owner reports.
