Filter Bag Clogged
Dolphin Robotic Pool Cleaner
Severity: MinorWhat Does This Error Mean?
A clogged filter bag or cartridge on a Dolphin robotic cleaner reduces suction, causes slow movement, and can trigger the unit to stop mid-cycle. The fix is to remove and clean the filter — this should be done after every 1-2 cleaning sessions.
Affected Models
- Dolphin Nautilus CC
- Dolphin Nautilus CC Plus
- Dolphin Premier
- Dolphin S300i
- Dolphin E10
- Dolphin Triton PS
Common Causes
- Normal debris accumulation — filter bags fill up with leaves, sand, and algae after each use
- Fine sand or silt bypassing the coarse bag and clogging the fine filter
- Algae bloom creating heavy debris load that clogs the filter mid-cycle
- Filter bag installed incorrectly, allowing debris to bypass it and clog the impeller
How to Fix It
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Remove the Dolphin from the pool and place it on a flat surface.
Always turn the unit off at the power supply and unplug before handling. Never lift the Dolphin out of the water by the cable — always use the handle.
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Open the filter access lid and remove the filter bag or cartridge.
On most Dolphin models the top lid snaps or clips open. The filter bag lifts straight out. On models with cartridge filters, lift the cartridge out of its housing.
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Shake out loose debris and rinse the filter thoroughly with a garden hose.
Rinse from the inside outward to push debris out through the mesh. For cartridge filters, rinse each panel individually. Do not use a pressure washer — it damages the mesh. For heavy algae buildup, soak the filter in a diluted pool filter cleaner for 15 minutes then rinse again.
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Inspect the filter bag for tears or holes before reinstalling.
Even small tears allow fine debris to pass through and eventually clog the impeller. Replace the bag if you find any damage — Dolphin replacement bags are widely available.
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Reinstall the filter and run another cleaning cycle.
Make sure the bag is seated correctly and the lid clips fully closed. An incorrectly seated bag will cause debris to bypass the filter and the cleaner will appear to not be picking up dirt.
Frequently Asked Questions
How often should I clean my Dolphin filter bag?
Dolphin recommends cleaning the filter bag after every use, or at minimum every 1-2 cleaning cycles. In pools with heavy debris (trees nearby, high bather load, algae issues) clean it after every single session. A clean filter is the single most important maintenance step for keeping the Dolphin running well.
Why does my Dolphin keep stopping before finishing a cycle?
The most common reason is a clogged filter bag reducing suction to the point where the motor overloads. Clean the filter, then restart the cycle. If it still stops early, check that the impeller is not blocked with debris — a small stone or twig jammed in the impeller is the second most common cause.