This robot costs $3,500. On my pressure gauge, it lost to a robot that costs around half the price — and it wasn’t close.
I’m Ryan, this is ActuallyUsed, and I’ve hooked over 20+ robotic pool cleaners up to a hydro manometer to measure the one number no spec sheet will give you: actual suction, in PSI, right at the intake port. And if you’re looking for a robotic pool cleaner, you’re in the right place. Suction is the most important factor in choosing a pool robot.
The real pulling force at the exact spot where a leaf either gets swallowed or gets left behind. Today you’re getting every number I’ve recorded, worst to first — and if you’ve been shopping by “gallons per hour,” a few of these results are going to sting. Let’s get in the water.
Why PSI Is the Number That Matters
A pool robot has one job: pick things up. It can have camera navigation, an app, AI mapping — if the suction isn’t there, you’ve bought an expensive pool toy that drives past leaves.
So what are we measuring? PSI — pounds per square inch — is the vacuum pressure at the robot’s intake. In my testing, it’s the single best predictor of whether a robot lifts an acorn or a soaked leaf off the floor, or just shoves it around. Higher PSI, and heavier debris comes up. Lower PSI, and the robot grabs fine silt while the big stuff sits there waiting for your net.
Here’s the catch, though: manufacturers almost never publish PSI. They publish flow rate — gallons per hour. And I want to be fair here, because those GPH numbers aren’t fake. They’re answering a different question. Flow rate counts the total water moving through the machine, including water pushed out of jets for propulsion and circulation. It tells you how big the pump is, not how hard the intake pulls at the floor. Two different measurements — and only one of them cleans your pool.
Want proof? Two robots in this test advertise 6,500 and 6,600 gallons per hour. On my gauge, they pulled 1.6 and 1.2 PSI. Meanwhile, a corded robot rated at a modest 4,500 GPH pulled 2.2 — the strongest reading I’ve ever logged. If flow rate predicted cleaning power, that result would be impossible. It isn’t. I’ve measured it again and again.
Think of it like a truck. GPH is the size of the engine. PSI is the pull at the hitch. You tow with the hitch.
And the stakes here aren’t academic. In my pool, the gap between 1.0 and 2.0 PSI is the gap between a robot that finishes the job and a robot you finish the job for — the difference between sand disappearing into the filter and sand swirling back down to the floor behind it. One of those robots replaces your pool net. The other one just keeps it company.
How I Test — and Why Almost Nobody Else Does
The tool is a hydro manometer — a sensitive pressure gauge built for water. I run a clear tube from the robot’s suction intake to the gauge, drop the robot in the pool, and record the vacuum pressure while it’s actually running. Same pool, same tube, same gauge, every single robot. Filters clean. Cordless units tested on a full charge.
And I want to be upfront about that last part, because it matters: every cordless number you’re about to see is a full-battery reading. Best-case scenario, fresh off the charger. What happens to suction as a battery drains across a two-hour cycle? That’s a test I’m running right now, robot by robot, and it’s getting its own video — so subscribe if you want those numbers, because I haven’t seen anyone publish them.
Why go to all this trouble? Because I’ve read a lot of spec sheets and I’ve measured a lot of robots, and the two rarely tell the same story. This manometer is my polygraph for spec sheets. If the box says “extreme suction,” the gauge either backs it up or it doesn’t. I’ve had robots with “turbo” in the marketing barely move the needle past 1.0 PSI in my pool.
And as far as I know, we’re one of the only channels — maybe the only one — measuring pool robot suction this way. Most reviews repeat the number on the box. I’d rather show you the number on the gauge.
The Leaderboard
Alright, the moment you clicked for. Here are my readings, taken in my pool under the same conditions. Here’s the full board so far of the top cleaners.
| # | Robot | Type | PSI on my gauge (full charge for cordless) | Intake width |
|---|---|---|---|---|
| 1 | Dolphin Premier | Corded | 2.2 | ~9.5" (dual) |
| 2 | Clear UV | Corded | 2.09 | Single port — the widest single intake I’ve tested |
| 3 | Dolphin Sigma | Corded | 2.0 | ~10" (dual) |
| 4 | Dolphin Quantum Pro | Corded | 1.9 | 7" |
| 5 | Dolphin Explorer E70 | Corded | 1.7 | ~6.5" |
| 6 | Beatbot AquaSense 2 (base) | Cordless | 1.6 (full charge) | ~6–7" |
| 7 | Beatbot AquaSense 2 Ultra | Cordless | 1.6 (full charge) | ~6.5" |
| 8 | Dolphin Cayman / Escape | Corded | 1.5 | ~5" |
| 9 | Beatbot AquaSense 2 Pro | Cordless | 1.5 (full charge) | ~6.5" |
| 10 | Polaris PCX iQ | Corded | 1.5 | ~6–8" |
| 11 | Aiper Scuba X1 Pro Max | Cordless | 1.3 (full charge) | ~6–7" |
| 12 | Aiper Scuba X1 | Cordless | 1.2 (full charge) | ~6–7" |
| 13 | Aiper Scuba X1 Pro | Cordless | 1.0 (full charge) | ~6–7" |
| 14 | Polaris VRX iQ+ | Corded | 1.0 | ~6–8" |
| 15 | Polaris Freedom | Cordless | 0.8 (full charge) | ~6" |
| 16 | Dolphin Nautilus CC | Corded | 0.8 | ~6" |
Stare at that board for ten seconds and the pattern jumps out: corded robots own the top, cordless robots pile up at the bottom. The spread runs from 2.2 down to 0.8 — the strongest robot I’ve measured pulls nearly three times the vacuum of the weakest.
Now the stories inside the numbers, because this is where it gets uncomfortable for some very expensive machines.
The $3,500 Beatbot AquaSense 2 Ultra pulled 1.6 PSI on a full charge. The $1,400 corded Dolphin Premier pulled 2.2 in the same pool, same setup. That’s 37.5% more suction for less than half the price. And here’s the one that made me laugh out loud: Beatbot’s own $1,100 base model matched the Ultra at 1.6. The cheapest robot in their lineup kept pace with their flagship on the one metric that decides whether your pool is clean.
The $1,650 Polaris VRX iQ+ managed 1.0 PSI — half the Sigma’s reading at nearly the same price. The $2,000 Dolphin Explorer E70 hit 1.7, which is respectable, but the older, cheaper Premier out-pulled it by half a PSI. In my experience that’s the tech tax at work: you pay extra for cameras, mapping, and app features, and on my gauge, none of it shows up as suction.
Then there’s the Aiper cluster. The Scuba X1, X1 Pro, and X1 Pro Max landed between 1.0 and 1.3 PSI on full batteries — and remember, the X1 is the one advertising 6,600 gallons per hour. That’s the biggest flow-rate claim in this entire test attached to some of the lowest suction readings on my gauge. The Pro Max at 1.3 was the best of the three, and it still trails a $700 corded Cayman. The Polaris Freedom sits at the very bottom of the cordless pack at 0.8, while its corded sibling, the PCX, was Polaris’s best showing at 1.5 — same body style, wall power, nearly double the pull.
Corded doesn’t automatically mean strong, either. The Dolphin Nautilus CC proved that at 0.8 PSI — tied with the weakest cordless unit I’ve tested. Fine for dust. Not lifting acorns.
Spec Sheet vs. Gauge
So how does a robot advertising 6,500 GPH lose to one rated at 4,500? Same answer as before: they’re measuring different things. Flow rate counts every gallon moving through the machine — propulsion jets, circulation loops, all of it. My gauge isolates one thing: pull at the intake, where debris actually enters. Neither number is dishonest. Only one of them predicts a clean pool.
Same story with the “4× more suction” style claims you see on boxes. Four times more than what? Across 16 robots, the biggest gap I’ve ever measured — top flagship versus bottom of the barrel — is 2.75 times. Between robots in the same class, the differences ran 20 to 50 percent. Nowhere on my chart does any robot pull four times any comparable robot. When you see a multiplier with no baseline attached, that’s not a measurement. That’s a slogan.
My rule is simple: if a spec sheet gives you flow rate but not intake pressure and not intake width, that spec sheet is incomplete. That’s not an accusation — it’s the reason I own a manometer.
Corded Power, and the 14-Touch Problem
Peak PSI is half the story. The other half is holding it. A corded robot draws wall power, so it delivers 100% output from minute one to minute one-twenty, every cycle, for years. My Premier held right around 2.2 through a full two-hour run with a clean filter — start of cycle, end of cycle, same number. A battery robot works from a finite energy budget. That’s physics, not a knock. How each model spends that budget across a full cycle is exactly what my drain-down testing will show, and those results get their own video.
But there’s a cost to cordless that no spec sheet mentions, and I can put a number on it because I lived it. The cordless routine: charge it, carry it out, drop it in, come back, fish it out, carry it back, dock it. Two handlings a day. Daily cleaning means 14 interactions a week. My corded Premier sits in the pool on a weekly timer, cleans every day on schedule, and I touch it once a week to rinse the filters. Fourteen versus one. At five minutes an interaction, that’s more than an hour every week managing the “convenient” robot. There’s no dock at the bottom of your pool. You are the docking station.
And before the comments fill up with “but the cord tangles” — the modern ProLine robots run anti-tangle swivels, and in weeks of daily scheduled cleans, my Premier’s cable never knotted once. The cord you’re worried about is a solved problem. The battery you’re not worried about is a daily one.
Wall power buys you one more thing: filtration. Dolphin’s NanoFilters trap particles down to about 2 microns, and forcing water through pleats that dense takes sustained motor power a battery can’t afford. That’s why nearly every cordless robot ships with basic mesh — and why the fine dust that clouds your water sails right through them.
Suction Width: The Spec Nobody Publishes
PSI is strength. Intake width is coverage — and it’s just as invisible on spec sheets. Think lawn mower: a deck half as wide means twice the passes.
I measure every intake. The Premier runs dual ports for about a 9.5-inch suction path. The Sigma is closer to 10. The Quantum Pro is 7. The Explorer E70 is 6.5. The Cayman sits around 5. The Beatbot Ultra uses a single inlet around 6.5 inches, and most cordless robots land between 6 and 7.
Do the math on Premier versus Beatbot Ultra: roughly 46% more suction path per pass, which means the Beatbot needs about 50% more passes to cover the same floor. And I watched what that looks like. In my pool, the Ultra passed over the same leaf three separate times without taking it in — sitting just off the edge of that narrow inlet every time. The Sigma, ten inches wide at 2.0 PSI, didn’t leave a single leaf in its lane all week.
Strong-but-narrow misses. Wide-but-weak pushes. The robots at the top of my board win because they’re both. PSI times width is pickup — that’s the whole formula.
Who’s Actually Worth It
Quick rules of thumb from 16 robots on the gauge: 2.0 PSI and up is elite — heavy-debris, deep-clean territory. Around 1.5 handles routine maintenance. At 1.0 or below, you’re in light-duty land. On width, 8 inches or more is excellent, 7 is solid, and 5 or less means a lot of extra passes. Now, where I’d actually put my money.
The Dolphin Premier is my top pick and the strongest robot I’ve measured: 2.2 PSI, a 9.5-inch dual-intake path, and the Multi-Media filter system — a leaf bag for the storm dumps, NanoFilters for the polish. At around $1,200 to $1,400, it out-pulled robots costing nearly three times as much on my gauge.
The Dolphin Sigma is right behind it at 2.0 PSI with the widest intake in the test, three motors, and the app control the Premier skips. In my head-to-head, it out-pulled the $3,500 Ultra by 25% at less than half the price.
The Clear UV is the wild card. It’s the first robot I’ve tested with UV-C sanitation built into the body — the same tech commercial water treatment has leaned on for years, riding around inside your pool cleaner. Its suction reading lands in my top tier, and the full Clear UV review has the whole story.
The Quantum Pro is the value story of 2026. Seven-inch intake, dual scrubbers, waterline cleaning, SmartNav mapping, and the XXL MaxBin — over 225% larger than a standard Dolphin basket — at a mid-tier price. And the gauge confirmed it: 1.9 PSI, fourth on my board and ahead of every cordless robot I’ve tested. The full Quantum Pro review has every detail.
On a tighter budget with a low-debris pool, the Cayman or Escape at 1.5 PSI nails the corded fundamentals — weekly timer, no battery drama — for a lot less money.
And the cordless crowd? On full batteries, the best of them matched a mid-range corded Dolphin and trailed the leaders by 25 to 40 percent — while costing up to two and a half times more and demanding 14 touches a week. If you truly have no outlet within reach of your pool, buy the Beatbot base model and skip the Ultra; the gauge says you lose nothing. Otherwise, the data points one direction.
Wrap-Up
So here’s the takeaway, and it fits on a sticky note: PSI and width. Ask for both. If a listing gives you neither, that spec sheet isn’t finished — and my gauge exists for exactly that reason. The strongest robots I’ve measured are corded. The most expensive robot I’ve tested is nowhere near the strongest. And the two numbers that decide whether your pool is actually clean are the two numbers almost nobody prints.
If this saved you from a $3,500 mistake, subscribe on YouTube, because the battery drain-down results and more reviews are coming soon. Drop a comment if you want a specific robot on the gauge; I read every one of them.
Thanks for watching, and I’ll catch you on the next one.
