Average score
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.3
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.2
Accessories and Tools
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.0
Unboxings typically include the robot, dock, ramp, cord, and manuals, with a dust bag preinstalled. Multiple reviewers note that extra consumables (spare bags or detergent) may not be included.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
3.6
Accessories vary by package: some reviewers got spare bags/mop parts, while others reported few or no extra consumables.
Aesthetic design and finish
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.6
Design and finish are consistently praised, with multiple reviewers calling the robot and dock premium-looking (brushed/metal-like textures and a sleeker base). Even reviewers with performance complaints tend to like the aesthetics.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.1
Design feedback is mixed: many like the clean white look, while others find it basic or worry the glossy finish shows marks/scratches.
AI, Smart, App and Automation
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.5
The Ecovacs app is widely praised for organization and depth (routines, maps, barriers, dock controls), and multiple sources mention Matter and voice features (including Yiko). A few note that some settings are buried or that the robot can be overly chatty.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.5
The Roborock app is widely praised for deep customization, schedules, and map edits; a few mention missing/quirky workflows (e.g., open-plan room splitting).
Airflow blowback
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.3
Multiple reviewers note reduced debris scattering compared with earlier models, sometimes crediting a slowed or redesigned side brush. Conversely, some negative experiences describe debris drops around thresholds or during return-to-dock events.
P2Product 2: Roborock Qrevo MaxV Robot Vacuum...
No score yetArea Rug Handling
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
3.4
Carpet detection is described as competent, but thick rugs and thresholds are recurring pain points in negative reviews. The robot is also described as limited to standard threshold heights rather than newer advanced climbing systems.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.5
Mixed-floor homes benefit from mop-lift + carpet detection, letting it clean rugs without soaking them in many cases.
Assembly and Setup
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.0
Setup is often described as straightforward, but several reviews mention initial firmware updates, mapping hiccups, or time spent editing room divisions. Planning a little extra time for first-run mapping improves the experience.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.6
Setup is repeatedly described as quick: minimal assembly, straightforward app onboarding, and fast initial mapping.
Battery and Charging
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
3.9
Battery impressions are mixed: official low-power runtimes are strong, but measured testing and higher-power settings can look below average for efficiency and coverage per charge. Recharge-and-resume helps, and some reviewers still find it sufficient for typical homes.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.4
Battery life is commonly cited around 180 minutes, with reliable recharge-and-resume behavior and good efficiency.
Bin and Bag
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
3.7
Several reviews note the robot’s internal bin is small for a flagship, increasing dependence on the dock. The dock’s disposable bag is described as large-capacity, but spare bags aren’t always included.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.4
Bagged auto-emptying and onboard bin capacity are viewed as convenient, with reports of weeks-long bag life in typical use.
Build quality and durability
P1Product 1: Ecovacs Deebot X9 Pro Omni...
No score yet
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
3.9
Build quality impressions vary: some find it solid, while others say materials feel less premium than Roborock’s flagship lines.
Carpet — High-Pile Pickup
P1Product 1: Ecovacs Deebot X9 Pro Omni...
No score yet
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.3
Deep/high-pile carpet cleaning is strong for a single-roller bot, but some reviewers say dual-roller flagships still clean thicker carpets better.
Carpet — Low-Pile Pickup
P1Product 1: Ecovacs Deebot X9 Pro Omni...
No score yet
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.5
Low-pile rugs are handled very well in both tests and everyday cleaning.
Carpet — Medium-Pile Pickup
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.7
Carpet performance is frequently rated near the top, with strong deep-clean results and above-average pickup on rugs. Some comparisons still argue the X8 is close enough on most tests that the X9’s premium is hard to justify.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.3
Carpet performance is generally strong, though at least one test reported weaker results on medium-pile compared with low-pile or top competitors.
Clogging and debris prevention
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
3.2
This is a key split point: multiple reviews report clogs with medium/large debris, pet hair, or messy mixtures, sometimes without timely alerts. Others report strong day-to-day debris handling with reduced scattering, suggesting performance depends on debris type and home layout.
P2Product 2: Roborock Qrevo MaxV Robot Vacuum...
No score yetComparative performance
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.6
In roundup-style coverage it’s presented as a top performer and award winner, but some side-by-side comparisons conclude the less expensive X8 (or other flagships) can be a better overall buy. The X9’s strengths are usually framed as best-in-class mopping and very strong all-around cleaning.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.2
Comparative testing often places it near the top for overall vacuum+mop combos, with tradeoffs mainly versus pricier flagships.
Controls and UI
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.0
App controls are generally seen as excellent, but physical controls and map-editing workflows get criticism in some reviews (sluggish button response or tedious confirmation steps). After setup, day-to-day control is usually straightforward.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.2
The app controls are generally clear and feature-rich; the built-in voice assistant is seen as helpful by some but limited/overly sensitive by others.
Corner Cleaning (Robot)
P1Product 1: Ecovacs Deebot X9 Pro Omni...
No score yet
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.0
Corners remain a common limitation (round body + geometry), even though edge cleaning is strong.
Crevice / Groove Pickup (Hard Floors)
P1Product 1: Ecovacs Deebot X9 Pro Omni...
No score yet
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.1
Crevice pickup is generally above average, with some tests showing it can pull debris from fairly deep cracks.
Dirty water sensor
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.6
Some reviews call out a dirty-water sensing feature in the dock that can adjust washing based on how dirty the pads are. It’s consistently described as a higher-end automation feature rather than a must-have.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.5
Dirty-water/dirt sensing is cited as useful for triggering extra mop washing when pads are especially dirty.
Docking and Auto-Empty Reliability (Robot)
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
3.9
The OMNI dock is broadly viewed as full-featured and convenient, combining auto-empty, refill, and mop washing/drying. A minority of reports mention a one-off auto-empty clog/failure or debris dropping on the way back to the dock, so reliability is strong but not flawless.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.5
The dock is a core strength (auto-empty + hot-water mop washing + drying), but it still requires water-tank service and occasional tray/plate cleaning.
Dried-On Stain Removal
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.9
Reviewers cite exceptional performance on dried-on messes, including lab-style scoring that places it near the top of recorded results. Real-home testers also report it can scrub sticky spots that older robot mops often leave behind, though not always perfectly.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.4
Dried-on stain results are strong (coffee/grape/sauce), sometimes ranking near the top; the most stubborn spots may need extra passes.
Ease of use
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.0
When everything is dialed in, reviewers describe an almost set-and-forget experience with strong automation. Negative experiences typically stem from clogs, threshold issues, or mapping inaccuracies that demand more intervention.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.4
Overall usability is high once configured, but convenience drops if you regularly need to pre-tidy cords or de-tangle long hair.
Edge and Baseboard Cleaning (Hard Floors)
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.4
Edge cleaning is typically a strength thanks to extending brush/mop behavior, with several reviewers noting good wall-hugging and baseboard coverage. A common caveat is that the roller shape may miss a strip near certain appliances or toe-kicks.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.6
Edge/baseboard mopping is a standout due to the extending mop, with repeated mentions of near wall-to-wall coverage.
Emptying and Mess Control
P1Product 1: Ecovacs Deebot X9 Pro Omni...
No score yet
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.6
Auto-emptying is described as clean and convenient; you still need to replace bags and manage dirty water.
Filtration / Dust Containment
P1Product 1: Ecovacs Deebot X9 Pro Omni...
No score yet
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.4
HEPA-style filtration and sealed dust handling are mentioned as effective, with no major dust-containment complaints.
Floor Drying Time
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.6
Lower water left behind and hot-air drying are commonly noted, which can help floors dry faster and reduce lingering dampness. Some owners still mention long deep-clean cycles that may include recharge breaks, but drying performance is generally praised.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.5
Mopping leaves a thin layer that dries quickly, and the dock’s pad drying helps reduce lingering dampness.
Fresh Liquid Pickup Speed
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.6
Several sources emphasize that the roller design can handle small wet spills by separating dirty water rather than dragging a damp pad across the floor. Demo-style testing (e.g., spilled milk) suggests it can clean quickly with minimal smearing compared with traditional pad mops.
P2Product 2: Roborock Qrevo MaxV Robot Vacuum...
No score yetHair-removal channel issues
P1Product 1: Ecovacs Deebot X9 Pro Omni...
No score yet
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
3.0
Long-hair wrap on the side brush is a recurring complaint and can be time-consuming to clean.
Hair Pickup — Carpets
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.7
Carpet hair pickup is widely reported as strong, including high pet-hair percentages in testing and positive real-home pet results. Performance can drop if debris clogs the airflow path or during tricky threshold transitions.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.6
Carpet hair pickup is strong overall, though occasional clumps/fluff can still need a quick touch-up.
Hair Pickup — Hard Floors
P1Product 1: Ecovacs Deebot X9 Pro Omni...
No score yet
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.6
Hard-floor hair pickup is frequently praised, including for pet hair.
Hair‑Wrap / Tangle Resistance
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.4
Many sources highlight anti-tangle brush features (ZeroTangle/active hair removal) with lab tests showing near-zero tangling. At least one reviewer still experienced significant hair wrapping during problem runs, so it’s excellent but not guaranteed.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.0
Main-brush tangling is usually well controlled, but long hair can still wrap the side brush and needs periodic clearing.
Hard Floor — Fine Dust Pickup
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.7
Hard-floor dust pickup is consistently described as strong, with reviewers noting reliable capture of micro debris and fine dust. Some negative reviews still credit it for routine dust pickup even when larger-debris clogs occur.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.7
Hard-floor fine debris pickup is consistently excellent in tests and daily use.
Hard Floor — Large Debris Intake
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.7
Large-debris handling is generally good, but multiple reviews note edge cases where larger particles, thresholds, or entering/exiting the dock can lead to drops. Very large debris can also contribute to clogs on some floors.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.6
Large-debris pickup on hard floors is a strength, though tight inside corners can still be a weak spot.
Headlight and LED lights
P1Product 1: Ecovacs Deebot X9 Pro Omni...
No score yet
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.2
Headlights/LEDs are noted as helpful in low light, supporting more consistent cleaning in darker rooms.
Heating element
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.6
Heated mop washing and heated-air drying are frequently highlighted, with some reviews noting adjustable wash/dry behavior. This is repeatedly framed as a premium feature that improves hygiene and reduces damp odors.
P2Product 2: Roborock Qrevo MaxV Robot Vacuum...
No score yetInnovation compared to competitors
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.7
Reviewers frequently call out the roller self-washing concept and BLAST airflow path as meaningful advances over older hybrids. It’s still in a competitive field (other brands have strong threshold handling or alternative mop designs), but the X9’s implementation is often viewed as one of the more complete packages.
P2Product 2: Roborock Qrevo MaxV Robot Vacuum...
No score yetLow-profile design
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
3.9
Internal LiDAR is positioned as a design win for getting into tighter spaces compared with tower designs. Measured height is still around the high-3-inch range, so ultra-low furniture may remain out of reach.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.0
A relatively low body for a LiDAR robot helps it reach under more furniture, though the sensor turret still limits very low clearances.
Maintenance requirements
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.2
Routine upkeep is generally reduced thanks to dock automation and app reminders, but several reviewers still recommend periodic tank cleaning and occasional brush/roller clearing. Sticky, paste-like messes can create a bigger cleanup burden.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
3.9
Automation reduces upkeep, but reviewers still mention periodic brush hair removal and cleaning the wash tray/plate.
Map and Path Efficiency (Robot Vacuums)
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.0
Some reviewers describe fast, efficient coverage and strong navigation once maps are set. Others report inaccurate initial mapping (especially in larger rooms) and more manual tweaking than expected for a flagship.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.2
Maps are detailed and coverage is efficient, but some tests note slower overall run times and occasional quirks segmenting open floor plans.
Mop lifting system
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.6
Multiple reviews mention automatic lifting behavior to protect carpets (mop lift, and in some descriptions additional component lifting). This generally helps with mixed-floor homes, though the robot is still limited on very tall thresholds or very thick rugs.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.6
Mop lift height (often cited around 10 mm) is repeatedly praised for keeping carpets/rugs drier during mixed runs.
Mopping performance
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.6
The self-washing roller mop is repeatedly called the standout feature, delivering strong scrubbing and excellent day-to-day hard-floor cleaning. A few tests found minor limitations (toe-kicks/appliances it can’t slide under, or slight stickiness/residue on messy stress tests), but it still ranks among the best.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.5
Mopping is widely rated excellent for daily maintenance and coverage; a few compare it as slightly less ‘deep scrub’ than top sonic/vibrating systems.
Noise level
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.4
Operational noise is generally described positively (quiet or unobtrusive), and some coverage suggests BLAST aims to improve performance without a big noise penalty. Few reviews provide direct measurements, so perceptions dominate.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.3
Often described as quiet for its performance (some measurements/estimates around low‑50 dB), though max power is still noticeable.
Obstacle Avoidance (Robot)
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.2
Obstacle avoidance is generally rated above average, with good performance around common household items. Still, multiple reviewers report occasional real-world snags (chair legs, protrusions, or clutter), so it’s not consistently flawless.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
3.6
Obstacle avoidance is mixed: some report cable/small-item misses, while others (especially post-update) see meaningful improvement.
Odor control
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.8
Hot-air drying and regular mop washing are repeatedly credited with preventing the damp, mildew-like smell that some robot mops develop. A few owners still clean the dirty-water tank regularly to avoid odors.
P2Product 2: Roborock Qrevo MaxV Robot Vacuum...
No score yetOngoing ownership costs (bags, filters, batteries)
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
3.2
Ongoing costs can include disposable dust bags and detergent, and some reviews cite specific replacement pricing. This contributes to the sense that the X9’s total cost of ownership is premium, especially versus the X8.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
3.7
Ongoing costs mainly come from dust bags and wear items; some reviewers explicitly flag bag replacement as a recurring expense.
Packaging quality
P1Product 1: Ecovacs Deebot X9 Pro Omni...
No score yet
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.6
Packaging is praised as well organized in at least one review, making unboxing/setup smoother.
Pet-Ready Features
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.7
Pet-focused commentary is largely positive: tests show strong pet-hair pickup and many highlight pet-oriented app features. The main pet-related downside raised is that heavy hair and larger debris can still contribute to clogs in certain homes.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.4
Pet hair pickup is a frequent highlight, and some reviews mention pet-focused modes/behaviors and monitoring features.
Price and Value
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
3.5
Value is polarized: some reviewers say the performance and automation justify the splurge, while others recommend it only on sale or prefer the cheaper X8/competitors at full MSRP. The $200+ gap to close siblings is a recurring theme.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
3.9
Value depends heavily on sale price: several call it feature-packed for the money, but many still label it expensive at MSRP.
Privacy controls
P1Product 1: Ecovacs Deebot X9 Pro Omni...
No score yet
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
3.0
The camera enables remote viewing/video calls; at least one reviewer flags camera-equipped robots as a privacy dealbreaker and suggests choosing camera-free if concerned.
Self-cleaning cycle
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.6
Both the robot and dock emphasize self-cleaning: the roller refreshes during runs, and the dock can wash and dry the mop and clean its basin. Reviewers still report occasional manual cleanup after unusually sticky or heavy messes.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.0
Automatic mop washing/drying is strong, but some reviewers note the wash plate/board gets dirty and needs manual cleaning; periodic pad washing helps.
Software-update support / feature longevity
P1Product 1: Ecovacs Deebot X9 Pro Omni...
No score yet
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.5
A documented firmware update improved obstacle avoidance in testing, suggesting active software tuning and support.
Solution / Liquid system
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.4
A detergent reservoir/auto-dispensing system and adjustable water output are noted across several reviews, enabling hands-off mopping. A few sources mention proprietary-solution recommendations or smaller solution tanks, which can increase refills or cost.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
3.0
Multiple reviews call out limited/no detergent dosing (or not being able to use solution), a notable gap versus some rivals.
Storage footprint and upright-stand stability
P1Product 1: Ecovacs Deebot X9 Pro Omni...
No score yet
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
3.5
The dock is tall/space-hungry and needs a dedicated spot, even if it’s slimmer than some competitors’ stations.
Streaking / Residue
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.2
Many reviews report low water left behind and good streak control, and some highlight adjustable moisture settings. However, a few stress tests (jelly or flour-and-water paste) left mild residue or streaks, indicating outcomes depend on mess type and settings.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.6
Streaking is generally low, with settings/features that help keep finish even; deep-scrub expectations may still require tuning.
Stuck resistance
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
3.6
Reports vary from near trouble-free operation to frequent help alerts depending on home layout. Thresholds and odd obstacles can cause wedging or debris drops in some tests, while careful mapping/no-go zones improves reliability for others.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.4
Reviews often report few rescues, with good threshold handling and less tendency to get stranded or stuck.
Suction and Airflow
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.6
Most reviews describe very strong pickup driven by Ecovacs’ BLAST airflow approach, with top-tier results on both hard floors and carpet. A few reviewers say the real-world improvement over the X8 is modest and that large debris can still trigger drops or clogs.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.5
Strong 7,000‑Pa-class suction in reviews, with solid pickup across surfaces; a few note flagships can still edge it on deepest crevices or thick carpet.
Support and Reliability
P1Product 1: Ecovacs Deebot X9 Pro Omni...
No score yet
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.3
Reliability notes are mostly positive (stable operation/connectivity), though obstacle/cable situations can still cause interruptions if floors aren’t prepped.
Under-Furniture Pickup
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
3.7
The internal LiDAR approach avoids a tall turret and helps it reach under more furniture than tower-based bots. Still, reviewers note the roller mop can’t slide under some low-clearance areas the way flat pads can.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.5
Under-furniture/toe-kick reach is highlighted as better than average in hands-on use.
Water tank
P1
Product 1: Ecovacs Deebot X9 Pro Omni...
4.1
The clean/dirty tank setup is commonly described as easy to use, but there are tradeoffs: some miss transparent or externally visible tanks, some describe smaller/hidden tanks requiring more frequent refills, and dirty tanks can have corners that trap grime.
P2
Product 2: Roborock Qrevo MaxV Robot Vacuum...
4.3
Large dock tanks reduce refill frequency in some homes, but dirty-water emptying can be frequent if you mop often.