When selecting a reliable and affordable robotic pool cleaner for in-ground pools, the Dolphin Proteus DX4 vs Dolphin Proteus DX3 both emerge as strong contenders. Manufactured by Maytronics, a leader in automated pool maintenance, these two models offer powerful cleaning solutions without the high price tags of premium units. Although both fall under the same product family, they differ in terms of cleaning capabilities, waterline access, filtration, and scheduling control.
In this detailed analysis of the Dolphin Proteus DX4 vs Dolphin Proteus DX3, we evaluate each model across all key performance categories to determine which robotic pool cleaner delivers better results for long-term convenience, debris management, and surface cleanliness. If you’re considering one of these reliable models for your home pool, this article will guide you to the most informed decision.
Contents
Differences Between Dolphin Proteus DX4 vs Dolphin Proteus DX3
Below is a summary of the specifications:
Pool Size and Cleaning Coverage
The Dolphin Proteus DX4 is designed for in-ground pools up to 50 feet, making it ideal for medium to large residential pools. It covers the pool floor, walls, and waterline, ensuring complete 3-axis cleaning. This comprehensive coverage is a major advantage for pool owners seeking a solution that tackles scum buildup along the tile line in addition to standard dirt on the floor.
The Dolphin Proteus DX3, by contrast, is optimized for pools up to 33 feet in length and covers only the floor and walls. While it performs well for basic maintenance, it does not reach or scrub the waterline—an area prone to accumulating oil, sunscreen, and biofilm.
Winner: Dolphin Proteus DX4
With expanded pool size compatibility and full waterline access, it delivers broader and more complete cleaning coverage.
Brush Performance and Surface Agitation
Both the DX4 and DX3 use a single active front scrubbing brush, which spins faster than the robot’s movement speed to provide powerful agitation on pool surfaces. This active brush excels at dislodging dirt, algae, and debris from smooth and textured finishes, including vinyl, plaster, and fiberglass.
In practical use, the brushing performance is similar between the two models. However, the DX4’s additional waterline contact means it can apply scrubbing action to more surface area overall. This extra reach makes a noticeable difference in pool cleanliness, especially at the waterline where buildup is most visible.
Winner: Dolphin Proteus DX4
Although the brush design is the same, its ability to reach the waterline allows it to deliver a more thorough clean across more surface zones.
Filtration System and Debris Management
The DX4 includes a top-load filter basket that can be configured with both fine and ultra-fine filters, offering excellent performance for various debris types—from leaves and acorns to sand and pollen. This dual-layer filtration system improves clarity while capturing both large debris and microscopic particles in one cycle.
The DX3 also includes a top-load fine filter basket, but it does not ship with ultra-fine filter inserts. While it handles general dirt and debris effectively, it is less suited for pools affected by silt, dust, or fine organic contaminants.
Winner: Dolphin Proteus DX4
Its dual-layer filtration delivers better versatility and finer particle retention, making it ideal for maintaining crystal-clear water.
Waterline Cleaning Capability
This is where the difference becomes most apparent. The DX4 is engineered to climb and scrub the waterline, using its sensors and traction system to stay elevated during the cleaning cycle. This area is typically where body oils, sunscreen residue, and floating debris accumulate, so being able to clean this zone is a key feature for maintaining pristine aesthetics.
The DX3 does not offer waterline cleaning. It climbs walls up to just below the tile line but stops short of scrubbing that uppermost level of the pool wall. Over time, this can leave behind a noticeable scum line.
Winner: Dolphin Proteus DX4
With true waterline access, it provides a complete clean that leaves no visual residue behind at the surface.
Scheduling and Automation
The Proteus DX4 supports a built-in weekly timer through its power supply. Users can program the unit to automatically clean every day, every other day, or every third day. This kind of passive automation is essential for users who want consistent maintenance without manual intervention.
The DX3 lacks a scheduling feature altogether. Each cleaning session must be initiated manually, which may be inconvenient for users seeking a low-maintenance experience.
Winner: Dolphin Proteus DX4
The ability to automate the cleaning cycle on a set schedule adds major convenience and time-saving benefits.
Cable Design and Operational Range
The DX4 is equipped with a 60-foot tangle-resistant cable, giving it sufficient reach for large pools and freeform layouts. While it lacks a swivel feature, its floating design minimizes tangling during operation.
The DX3 includes a 50-foot tangle-resistant cable, which is adequate for smaller pools but may limit cleaning range in larger or more irregularly shaped installations.
Winner: Dolphin Proteus DX4
Its longer cable and extended reach provide greater coverage flexibility for medium and large pools.
Weight, Portability, and Storage
The DX3, weighing just 14 lbs, is easier to carry and handle, especially for users who prioritize portability. Its lightweight frame and compact footprint make it well-suited for quick deployment and simple storage.
The DX4 weighs 18.5 lbs, which is still manageable but slightly heavier. This additional weight helps it maintain stronger wall and waterline adhesion, but it may be less convenient to lift for some users.
Winner: Dolphin Proteus DX3
For users who prioritize portability and ease of handling, its lighter build offers clear advantages.
Maintenance and User Convenience
Both models feature top-access filter baskets, making routine maintenance straightforward. Users can lift the lid, remove the filter, hose it off, and reinstall it without flipping the robot. This design simplifies upkeep and is preferred over older bottom-loading systems.
However, only the DX4 offers ultra-fine filtration, which may require more frequent rinsing depending on debris level, but ultimately results in clearer pool water.
Winner: Tie
Both units are easy to maintain, though the DX4’s enhanced filtration gives it a slight performance edge.
Quick Rundown Of Dolphin Proteus DX4
Quick Rundown Of Dolphin Proteus DX3
Conclusion
Choose the Dolphin Proteus DX4 if you want a comprehensive robotic pool cleaner that offers full pool coverage, waterline cleaning, and the ability to automate your cleaning schedule. Its enhanced filtration and broader surface contact make it ideal for larger pools or users looking for more complete, hands-off maintenance.
Choose the Dolphin Proteus DX3 if you’re looking for a lightweight, budget-friendly option designed for smaller in-ground pools. It delivers dependable performance on the floor and walls and is easy to manage, though it lacks advanced features like a scheduler or waterline access.
Overall Winner: Dolphin Proteus DX4
With full-surface cleaning, programmable scheduling, longer cable length, and ultra-fine filtration, the DX4 offers more cleaning power and automation—making it the best choice for homeowners who value performance and convenience in equal measure.