Compare Roborock Q7 Max+ Robot Vacuum vs Ecovacs Deebot X9 Pro Omni Robot Vacuum and Mop

P1 Roborock Q7 Max+ Robot Vacuum
P2 Ecovacs Deebot X9 Pro Omni Robot Vacuum and Mop

Comparison Takeaways

Roborock Q7 Max+ Robot Vacuum

Where It Has the Edge

  • Battery and Charging is 4.6 vs 3.9. Battery efficiency is described as excellent, with long runtimes and support for recharge-and-resume on larger homes.
  • Docking and Auto-Empty Reliability (Robot) is 4.5 vs 3.9. Docking and auto-empty reliability are generally strong, with bags lasting weeks for many homes and consistent returns-to-dock behavior...
  • Ongoing ownership costs (bags, filters, batteries) is 3.7 vs 3.2. Expect ongoing consumables. Several reviews mention disposable dust bags (often changed every few weeks to about two months)...
  • Map and Path Efficiency (Robot Vacuums) is 4.4 vs 4.0. A standout strength. Multiple reviewers highlight fast LiDAR mapping, systematic coverage, and very high navigation efficiency, including multi-floor...

Ecovacs Deebot X9 Pro Omni Robot Vacuum and Mop

Where It Has the Edge

  • Obstacle Avoidance (Robot) is 4.2 vs 1.8. Obstacle avoidance is generally rated above average, with good performance around common household items. Still, multiple reviewers report...
  • Hair Pickup — Carpets is 4.7 vs 3.2. Carpet hair pickup is widely reported as strong, including high pet-hair percentages in testing and positive real-home pet...
  • Mopping performance is 4.6 vs 3.5. The self-washing roller mop is repeatedly called the standout feature, delivering strong scrubbing and excellent day-to-day hard-floor cleaning....
  • Noise level is 4.4 vs 3.3. Operational noise is generally described positively (quiet or unobtrusive), and some coverage suggests BLAST aims to improve performance...
Average score
Product 1: Roborock Q7 Max+ Robot Vacuum
3.8
Product 2: Ecovacs Deebot X9 Pro Omni...
4.3
Accessories and Tools
Product 1: Roborock Q7 Max+ Robot Vacuum
3.6

Included accessories vary by package and reviewer; the core set centers on the robot, dock, and mop attachment, while some reviews noted limited spare mop cloths or a missing pad in their box.

Product 2: 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.

Aesthetic design and finish
Product 1: Roborock Q7 Max+ Robot Vacuum
No score yet
Product 2: 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.

AI, Smart, App and Automation
Product 1: Roborock Q7 Max+ Robot Vacuum
4.5

The app and automation features are repeatedly praised: room and zone cleaning, scheduling, no-go/no-mop zones, multi-floor and 3D mapping, and voice-assistant options are commonly cited.

Product 2: 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.

Airflow blowback
Product 1: Roborock Q7 Max+ Robot Vacuum
No score yet
Product 2: 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.

Area Rug Handling
Product 1: Roborock Q7 Max+ Robot Vacuum
3.7

Rug handling is mostly positive for vacuuming (detection and boost), but mopping requires planning because the pad does not lift; several reviewers rely on no-mop zones or removing the mop on carpeted areas.

Product 2: 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.

Assembly and Setup
Product 1: Roborock Q7 Max+ Robot Vacuum
4.1

Setup is generally easy with app guidance and quick mapping, though a few reviewers mention minor dock assembly steps and the initial configuration time.

Product 2: 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.

Battery and Charging
Product 1: Roborock Q7 Max+ Robot Vacuum
4.6

Battery efficiency is described as excellent, with long runtimes and support for recharge-and-resume on larger homes.

Product 2: 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.

Bin and Bag
Product 1: Roborock Q7 Max+ Robot Vacuum
3.9

The combined dustbin/water-tank design is convenient but can create tradeoffs; one review reports moisture getting into the dustbin during mopping, while others found the bagged dock system tidy.

Product 2: 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.

Carpet — High-Pile Pickup
Product 1: Roborock Q7 Max+ Robot Vacuum
4.3

At least one reviewer reports convincing results even on longer-pile carpet, though this is not the model’s primary focus compared with premium flagships.

Product 2: Ecovacs Deebot X9 Pro Omni...
No score yet
Carpet — Low-Pile Pickup
Product 1: Roborock Q7 Max+ Robot Vacuum
4.2

Low-pile carpet performance is commonly rated strong, aided by carpet boost and efficient, repeated passes.

Product 2: Ecovacs Deebot X9 Pro Omni...
No score yet
Carpet — Medium-Pile Pickup
Product 1: Roborock Q7 Max+ Robot Vacuum
4.1

Medium-pile carpet deep-clean results are consistently described as strong or above average in test-style reviews, helped by carpet boost.

Product 2: 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.

Child lock
Product 1: Roborock Q7 Max+ Robot Vacuum
4.0

Child lock is explicitly mentioned as available, helping prevent accidental starts or button presses.

Product 2: Ecovacs Deebot X9 Pro Omni...
No score yet
Clogging and debris prevention
Product 1: Roborock Q7 Max+ Robot Vacuum
No score yet
Product 2: 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.

Comparative performance
Product 1: Roborock Q7 Max+ Robot Vacuum
4.2

In comparisons, the Q7 line ranks highly for core pickup and sometimes hair handling, but it falls behind newer flagship models on mopping and object avoidance.

Product 2: 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.

Controls and UI
Product 1: Roborock Q7 Max+ Robot Vacuum
4.1

Controls are simple on the robot and most interaction happens in the app. Reviewers describe the UI as straightforward and feature-rich once configured.

Product 2: 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.

Corner Cleaning (Robot)
Product 1: Roborock Q7 Max+ Robot Vacuum
3.4

Corner performance is decent but inconsistent; some reviewers mention missed debris in corners compared with newer corner-focused robots.

Product 2: Ecovacs Deebot X9 Pro Omni...
No score yet
Crevice / Groove Pickup (Hard Floors)
Product 1: Roborock Q7 Max+ Robot Vacuum
3.4

Crevice and groove pickup is described as average in controlled tests, but still sufficient for routine hard-floor cracks with proper passes.

Product 2: Ecovacs Deebot X9 Pro Omni...
No score yet
Dirty water sensor
Product 1: Roborock Q7 Max+ Robot Vacuum
No score yet
Product 2: 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.

Docking and Auto-Empty Reliability (Robot)
Product 1: Roborock Q7 Max+ Robot Vacuum
4.5

Docking and auto-empty reliability are generally strong, with bags lasting weeks for many homes and consistent returns-to-dock behavior noted by reviewers.

Product 2: 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.

Dock noise
Product 1: Roborock Q7 Max+ Robot Vacuum
2.6

Dock emptying is commonly described as loud, even if the burst is short.

Product 2: Ecovacs Deebot X9 Pro Omni...
No score yet
Dried-On Stain Removal
Product 1: Roborock Q7 Max+ Robot Vacuum
No score yet
Product 2: 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.

Ease of use
Product 1: Roborock Q7 Max+ Robot Vacuum
4.2

Day-to-day use is easy once mapped: scheduling, zones, notifications, and the option to disable automatic emptying make it flexible for different routines.

Product 2: 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.

Edge and Baseboard Cleaning (Hard Floors)
Product 1: Roborock Q7 Max+ Robot Vacuum
3.5

Edge cleaning is good but not perfect. Some reviewers report a small strip of missed debris along baseboards, especially compared with newer edge-focused designs.

Product 2: 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.

Edge‑Following Accuracy (Robot)
Product 1: Roborock Q7 Max+ Robot Vacuum
4.3

Wall tracking is generally accurate, with reviewers noting it follows edges and slows near obstacles rather than ping-ponging randomly.

Product 2: Ecovacs Deebot X9 Pro Omni...
No score yet
Emptying and Mess Control
Product 1: Roborock Q7 Max+ Robot Vacuum
4.4

Auto-emptying into a sealed bag reduces hands-on mess and dust clouds, and reviewers like the ability to control or schedule emptying.

Product 2: Ecovacs Deebot X9 Pro Omni...
No score yet
Filtration / Dust Containment
Product 1: Roborock Q7 Max+ Robot Vacuum
3.6

Filtration is typical for the class and needs routine care. Some reviewers call out standard filtering and the need to keep filters clean, especially when mixing vacuuming and mopping.

Product 2: Ecovacs Deebot X9 Pro Omni...
No score yet
Floor Drying Time
Product 1: Roborock Q7 Max+ Robot Vacuum
No score yet
Product 2: 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.

Fresh Liquid Pickup Speed
Product 1: Roborock Q7 Max+ Robot Vacuum
No score yet
Product 2: 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.

Hair-removal channel issues
Product 1: Roborock Q7 Max+ Robot Vacuum
2.8

A few reviewers mention hair or debris can lodge between the brush and suction path, creating occasional clogs that require quick manual attention.

Product 2: Ecovacs Deebot X9 Pro Omni...
No score yet
Hair Pickup — Carpets
Product 1: Roborock Q7 Max+ Robot Vacuum
3.2

Carpet hair pickup is mixed across sources: some tests report weak pet-hair removal, while other reviews describe acceptable to good results.

Product 2: 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.

Hair Pickup — Hard Floors
Product 1: Roborock Q7 Max+ Robot Vacuum
3.8

Hair pickup on hard floors is reported as good in several owner-style reviews, but at least one test-centric review measured weak pet-hair pickup, so results can vary by hair type and home.

Product 2: Ecovacs Deebot X9 Pro Omni...
No score yet
Hair‑Wrap / Tangle Resistance
Product 1: Roborock Q7 Max+ Robot Vacuum
3.7

Tangle resistance varies. Some reviewers highlight minimal wrapping and an easy-to-clean brush, while others (especially with long hair) report tangles that require occasional manual clearing.

Product 2: 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.

Hard Floor — Fine Dust Pickup
Product 1: Roborock Q7 Max+ Robot Vacuum
4.4

Fine-dust pickup on hard floors (including flour-style tests) is a consistent highlight across reviewers and comparison videos.

Product 2: 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.

Hard Floor — Large Debris Intake
Product 1: Roborock Q7 Max+ Robot Vacuum
4.2

Large-debris pickup on hard floors is generally very strong, though a few tests still show occasional leftovers with larger items like cereal.

Product 2: 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.

Heating element
Product 1: Roborock Q7 Max+ Robot Vacuum
No score yet
Product 2: 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.

Innovation compared to competitors
Product 1: Roborock Q7 Max+ Robot Vacuum
No score yet
Product 2: 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.

Low-profile design
Product 1: Roborock Q7 Max+ Robot Vacuum
No score yet
Product 2: 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.

Maintenance requirements
Product 1: Roborock Q7 Max+ Robot Vacuum
No score yet
Product 2: 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.

Map and Path Efficiency (Robot Vacuums)
Product 1: Roborock Q7 Max+ Robot Vacuum
4.4

A standout strength. Multiple reviewers highlight fast LiDAR mapping, systematic coverage, and very high navigation efficiency, including multi-floor maps and recharge-and-resume.

Product 2: 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.

Mop lifting system
Product 1: Roborock Q7 Max+ Robot Vacuum
No score yet
Product 2: 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.

Mopping performance
Product 1: Roborock Q7 Max+ Robot Vacuum
3.5

Mopping is widely framed as maintenance-level. The robot can apply pressure and offers adjustable water, but lacks vibration and mop lifting, so stains often need extra passes or manual cleanup.

Product 2: 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.

Noise level
Product 1: Roborock Q7 Max+ Robot Vacuum
3.3

Vacuuming noise is generally moderate, but multiple reviews note it gets noticeably louder on max power or thicker carpets.

Product 2: 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.

Obstacle Avoidance (Robot)
Product 1: Roborock Q7 Max+ Robot Vacuum
1.8

A major limitation: multiple reviews state it does not have true object avoidance, so it may bump into items and is not ideal for cords, toys, or pet waste.

Product 2: 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.

Odor control
Product 1: Roborock Q7 Max+ Robot Vacuum
No score yet
Product 2: 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.

Ongoing ownership costs (bags, filters, batteries)
Product 1: Roborock Q7 Max+ Robot Vacuum
3.7

Expect ongoing consumables. Several reviews mention disposable dust bags (often changed every few weeks to about two months) plus periodic filter and brush upkeep.

Product 2: 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.

Pet-Ready Features
Product 1: Roborock Q7 Max+ Robot Vacuum
No score yet
Product 2: 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.

Price and Value
Product 1: Roborock Q7 Max+ Robot Vacuum
3.6

Value impressions are mixed: some reviewers feel the price is high versus older models with better object avoidance, while others consider the mapping plus auto-empty package a strong deal.

Product 2: 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.

Privacy controls
Product 1: Roborock Q7 Max+ Robot Vacuum
4.6

Privacy is a plus for some owners because it uses LiDAR navigation rather than a camera-based object recognition system.

Product 2: Ecovacs Deebot X9 Pro Omni...
No score yet
Self-cleaning cycle
Product 1: Roborock Q7 Max+ Robot Vacuum
No score yet
Product 2: 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.

Software-update support / feature longevity
Product 1: Roborock Q7 Max+ Robot Vacuum
4.3

Roborock software support is viewed positively in the reviews that mention it, with frequent app updates and long-lived features like mapping and automation.

Product 2: Ecovacs Deebot X9 Pro Omni...
No score yet
Solution / Liquid system
Product 1: Roborock Q7 Max+ Robot Vacuum
No score yet
Product 2: 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.

Storage footprint and upright-stand stability
Product 1: Roborock Q7 Max+ Robot Vacuum
3.0

The auto-empty dock is substantial and needs dedicated floor space near an outlet; at least one reviewer notes it is hard to tuck away under low furniture.

Product 2: Ecovacs Deebot X9 Pro Omni...
No score yet
Streaking / Residue
Product 1: Roborock Q7 Max+ Robot Vacuum
No score yet
Product 2: 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.

Stuck resistance
Product 1: Roborock Q7 Max+ Robot Vacuum
3.2

Navigation is excellent, but the robot can still get stuck on cords, plant stands, or tricky surfaces like very dark rugs; reviews recommend clearing clutter and using no-go zones.

Product 2: 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.

Suction and Airflow
Product 1: Roborock Q7 Max+ Robot Vacuum
3.8

Bench-style tests describe suction and airflow as around average, even though real-world pickup often looks strong thanks to brush design and pathing.

Product 2: 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.

Under-Furniture Pickup
Product 1: Roborock Q7 Max+ Robot Vacuum
No score yet
Product 2: 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.

Water tank
Product 1: Roborock Q7 Max+ Robot Vacuum
No score yet
Product 2: 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.