Choosing the right robotic pool cleaner starts with your pool dimensions, but size is only one part of the decision.
For Australian pools, you should also compare the cleaner's recommended pool size, cleaning coverage, runtime, filter capacity, navigation and pool layout. A simple 6 × 3 m pool with light debris has very different requirements from a 10 × 5 m pool surrounded by trees.
A cleaner that is too small may require repeated cycles or frequent charging. A much larger model may add capacity that a smaller pool does not need.
The practical goal is to choose a cleaner that has enough capacity to complete the required cleaning job without making the specification sheet more complicated than it needs to be.
Pool Dimensions Are the Starting Point
For a straightforward rectangular pool:
Length × Width = Approximate Pool Surface Area
For example:
8 m × 4 m = 32 m²
For a kidney-shaped or freeform pool, divide it into smaller sections and estimate the total surface area.
Pool volume in cubic metres can be useful for some pool equipment, but robotic cleaner sizing should start with the dimensions and surface area the robot needs to cover.
Once you know the pool size, compare five factors.
5 Factors That Determine Robotic Pool Cleaner Size
1. Pool Dimensions and Surface Area
A larger pool requires a cleaner that can cover more area efficiently.
However, pool length should not be treated as a direct runtime calculation. A 10 m pool does not automatically require a particular number of hours. Actual cleaning time depends on the cleaning mode, navigation pattern, debris load and whether the cleaner is also climbing walls and cleaning the waterline.
The most useful specification is therefore the manufacturer's recommended maximum pool size.
For example, a cleaner rated for 6 × 12 m is intended for a very different pool-size range from one rated for 10 × 18 m. The rating should be treated as a compatibility limit rather than a promise that every pool of that size will clean equally quickly.
2. Cleaning Coverage
Pool size tells you how much area needs cleaning. Coverage tells you which parts of that area the robot can clean.
| Cleaning coverage | Typical use |
|---|---|
| Floor only | Dirt, sand, leaves and settled debris |
| Floor + walls | Adds vertical wall cleaning |
| Floor + walls + waterline | Broader automatic coverage |
For a simple pool where most debris settles on the floor, floor cleaning may be sufficient.
Wall climbing becomes more useful when you want to reduce manual brushing. If the waterline also needs cleaning, check that the specific model supports it.
Do not assume that a larger robot automatically offers broader coverage.
3. Runtime and Charging Time
Runtime is one of the most important specifications for a cordless robotic pool cleaner.
Compare the runtime for the actual cleaning mode you intend to use, not just the maximum number shown in the headline specification.
A cleaner may have one runtime for floor-only cleaning and a substantially shorter runtime when cleaning the floor, walls and waterline.
For example, the current iGarden K60 is listed at:
| K60 specification | Current AU figure |
|---|---|
| Floor-only runtime | Up to 6 h |
| Floor + wall + waterline runtime | Approx. 3.5 h |
| Charging time | Approx. 5 h |
| Battery | 7.5 Ah / 192 Wh |
For a larger cleaner, the difference can be even more significant. The current K Pro 100 and K Pro 150 are listed at 10 h and 15 h respectively for floor-only cleaning, but 6 h and 8.5 h for floor + wall + waterline cleaning. Both list a 9-hour charging time and a 14.1 Ah / 364.2 Wh battery.
That is why "up to 10 hours" or "up to 15 hours" should never be interpreted as the runtime available for every cleaning mode.
4. Debris Load and Filter Capacity
Pool size does not tell you how much debris the robot needs to collect.
This is particularly relevant in Australian backyards where gum leaves, bark, blossoms, insects and wind-blown dust can create a heavy debris load.
A cleaner may have enough battery capacity for your pool but still require frequent intervention if its filter basket fills quickly.
Useful specifications include:
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Filter basket capacity
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Filtration level
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Brush design
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Debris pickup
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Ease of basket removal and cleaning
A current example is the iGarden K60, which uses a 4 L basket with 180 μm filtration.
The current K Pro range also uses a 4 L basket, giving a useful comparison point for larger-pool models.
For a pool that receives heavy leaf fall, basket capacity can therefore matter almost as much as battery capacity.
5. Pool Shape, Steps and Obstacles
Two pools with similar dimensions can still create very different cleaning workloads.
A simple rectangle is generally easier to navigate than a pool with:
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Steps
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Sloping sections
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Curved walls
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Multiple corners
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Tanning ledges
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Irregular or kidney-shaped sections
For these pools, navigation and climbing capability can be more important than simply adding battery capacity.
Look for specifications describing intelligent path planning, navigation sensors, adaptive movement and wall-climbing capability.
Australian Robotic Pool Cleaner Sizing Guide
There is no official Australian industry classification that defines a pool as "small", "medium" or "large" according to one fixed set of dimensions. Actual pool sizes vary considerably.
A practical starting guide is:
| Pool example | Surface area | Typical requirement |
|---|---|---|
| 6 × 3 m | 18 m² | Basic floor cleaning |
| 8 × 4 m | 32 m² | Regular residential cleaning |
| 10 × 4 m | 40 m² | Longer runtime or broader coverage |
| 10 × 5 m | 50 m² | Extended runtime and wall cleaning |
| 12 × 5 m | 60 m² | Larger cleaning capacity |
| 12 × 6 m | 72 m² | Longer runtime and efficient navigation |
| 15 × 8 m | 120 m² | Check high-capacity models carefully |
These are reference examples rather than fixed product categories. Pool shape, debris load and required cleaning coverage can change the actual requirement.
The manufacturer's rated pool size should take priority.
Using Real Product Specifications to Compare Capacity
A useful way to interpret sizing specifications is to compare pool size, runtime and cleaning mode together.
For example, current iGarden AU specifications show three useful capacity points:
| Model | Rated maximum pool size | Floor-only runtime | Floor + wall + waterline | Basket |
|---|---|---|---|---|
| K70 | 6 × 12 m | Up to 7 h | Approx. 3.75 h | 4 L |
| K Pro 100 | 8 × 15 m | Up to 10 h | 6 h | 4 L |
| K Pro 150 | 10 × 18 m | Up to 15 h | 8.5 h | 4 L |
The K60 is rated for up to 6 × 12 m, while the K Pro 100 and K Pro 150 extend the rated pool size to 8 × 15 m and 10 × 18 m respectively.
This illustrates an important sizing principle: pool dimensions alone do not determine required capacity.
A 6 × 12 m pool may fall within a cleaner's rated range, but if the pool has heavy debris, walls, waterline cleaning and a complex layout, its practical workload may be much higher than a simple floor-only pool of the same size.
What Size Cleaner Do I Need for Heavy Leaf Fall?
A large pool with heavy leaf fall should be assessed differently from a large pool in a sheltered yard.
For Australian pools surrounded by trees, focus on the combination of:
Basket capacity — how much debris can be collected before emptying.
Runtime — how long the cleaner can operate before charging.
Brush performance — how effectively it loosens and collects debris.
Navigation — whether it can cover the pool efficiently.
Cleaning coverage — whether walls and waterline also need attention.
For example, the K60 and K Pro models all use a 4 L basket, so the main difference between these models is not simply basket size. Runtime and rated pool size become more important when moving toward larger pools.
Above-Ground Pool Cleaner Sizing
Above-ground pools are often smaller and simpler, but the same sizing principles apply.
Before choosing a robotic pool cleaner, check:
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Pool diameter or length
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Water depth
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Pool surface
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Pool shape
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Floor and wall coverage
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Typical debris load
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Manufacturer compatibility
A smaller above-ground pool does not automatically require the smallest robotic cleaner available. The cleaning requirements still determine the appropriate capacity.
Choosing a Robotic Pool Cleaner in 5 Steps
Step 1: Measure the Pool
Record the length and width in metres and estimate the surface area.
Step 2: Check the Rated Pool Size
Compare your dimensions with the manufacturer's maximum recommended pool size.
Step 3: Choose the Required Coverage
Decide whether you need floor-only, floor + walls, or floor + walls + waterline cleaning.
Step 4: Compare Mode-Specific Runtime
For cordless cleaners, compare the runtime for the cleaning mode you actually use and check the charging time between cycles.
Step 5: Consider Your Pool Environment
Factor in steps, curves, ledges, pool surface, trees and typical debris load.
This gives you a much more reliable sizing decision than choosing based on a "large pool" label or headline battery capacity alone.
Common Sizing Mistakes
Choosing by Pool Volume Alone
Pool volume describes how much water the pool holds. It does not directly tell you how much surface area the robot needs to cover.
Using the Maximum Runtime as the Normal Runtime
A cleaner advertised with 10 or 15 hours of runtime may achieve that figure only in a specific cleaning mode. Always check the mode-specific specification.
Choosing Only by Pool Length
Two pools with the same length can have very different widths, shapes, obstacles and debris loads.
Ignoring Filter Capacity
A cleaner can have enough battery life but still require frequent basket emptying during heavy leaf periods.
Automatically Buying the Largest Model
Higher capacity is useful when it solves a real cleaning requirement. For a simple pool, additional runtime may offer little practical benefit.
Australian Pool Cleaner Sizing Checklist
| What to check | Why it matters |
|---|---|
| Pool length | Compare with rated pool size |
| Pool width | Determines surface area |
| Pool depth | Confirms compatibility |
| Pool shape | Affects navigation |
| Pool surface | Important for traction and climbing |
| Steps and ledges | May affect navigation |
| Cleaning coverage | Determines floor/wall/waterline requirements |
| Typical debris | Helps determine basket capacity |
| Runtime by mode | Shows whether one cycle is sufficient |
| Charging time | Important for cordless models |
| Filter basket capacity | Particularly important for leaf-heavy pools |
FAQs
Can I use a cleaner at its maximum rated pool size?
You can use a cleaner within its stated rating, but the maximum figure should not be treated as a guarantee of identical cleaning performance across every pool. A pool at the maximum dimensions with heavy debris, steps and wall cleaning can place a greater workload on the cleaner than a simple pool of the same size.
Does heavy leaf fall mean I need a bigger cleaner?
Not necessarily. Heavy leaf fall may make basket capacity and debris handling more important than simply choosing a model with a larger maximum pool size.
Do steps and tanning ledges change the sizing decision?
Yes. They can increase the navigation and climbing requirements even when the pool dimensions remain relatively small.
Does pool volume matter when choosing a robotic pool cleaner?
It can be useful background information, but pool dimensions, cleaning coverage and runtime are more directly relevant to robotic cleaner sizing.
