Separate pickup failure from lift-out spill
Let the robot stop and settle before retrieval. Bring it toward the edge as directed, lift by its handle rather than the cable, and pause near the surface to drain. Tilting a full unit can pour captured dirt through the intake even when filtration worked correctly.
Inspect the basket fit
Remove power, open the user-accessible compartment, and clean grit from rails, latches, and gasket surfaces. Reinstall panels in the proper orientation. A small folded edge or leaf stem across a seal can create a bypass that returns fine material to the pool.
Match media to particle size
A coarse basket suited to leaves may not retain powdery silt or pollen. If the manufacturer offers fine or layered inserts, use the specified option and expect more frequent rinsing. Do not add fabric, paper, or improvised liners that can block cooling water or enter an impeller.
Check flaps and accessible damage
Many intakes use a door or flap to hold debris when suction stops. Confirm it swings freely and is not held open by twigs, hair, or a pebble. Replace a torn flap, cracked basket, or broken latch with the correct part rather than gluing submerged plastic.
Consider what looks like escaped dirt
Brushes can stir sediment faster than the intake captures it, creating a cloud behind the unit. Allow water to settle and compare the floor before and after a full pass. Continued discharge from an outlet with a correctly installed fine filter warrants manufacturer review.
Use the robotic pool cleaner decision framework to compare the broader category, or narrow the catalog through Robotic Pool Cleaners for In-Ground Pools.
Exact products to compare
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Dolphin Nautilus CC Automatic Robotic Pool Cleaner
Best for: Owners who want a compact established corded cleaner
Dolphin Nautilus CC Plus Robotic Pool Cleaner
Best for: Buyers comparing a widely searched midrange Dolphin
Dolphin Nautilus CC Supreme Wi-Fi Robotic Pool Cleaner
Best for: Large pools needing broader cleaning-zone coverage
Frequently asked questions
Why does debris fall out when I lift the robot?
The basket may be full, the intake flap may be blocked, or the unit may be tilted before it drains. Use the documented retrieval position.
Can I line the filter with cloth?
No unless the manufacturer supplies that liner. Improvised media can restrict flow, overwork components, and come loose.
Does very fine dust always stay in a robot filter?
Not with every media grade. Confirm the available fine-filtration option and maintain the pool’s main filtration system as well.
Final decision
Match the answer above to the exact model manual, pool measurements and maintenance routine. Amazon listings can change by seller, bundle and generation, so verify the product name and ASIN before relying on a feature.