Dolphin m400 filter

dolphinm400filter

Double-check before purchasing

Specific filter part numbers for different M400 production revisions should be confirmed via the Maytronics parts lookup tool

Compatibility

The Dolphin M400 uses a dual cartridge filter system with fine-mesh and ultra-fine-mesh options available. Both filter types load into the M400's top-load access panel in matched pairs.

How to Verify Fit

M400 filters come as a pair — confirm both are installed and latched before each run
Fine mesh has visible openings; ultra-fine mesh is denser. Choose based on your pool's debris profile
After installation, the top-load lid should close completely flat with no gap

Common Mistakes to Avoid

Using E-series filters in the M400 — E-series filters are smaller and will not seal correctly in the M400 housing
Cleaning the filter inside the robot by running water through the top-load panel — always remove the basket first
Ignoring slight suction loss — it is the first sign of a clogged or damaged filter basket

When to Replace

Clean both M400 filters after every cycle. Replace the pair when either is damaged. Under typical use in a medium-large in-ground pool, expect to replace once per season.

Buying Tips

OEM Maytronics M400 filters are recommended. Third-party alternatives are available — verify M400 compatibility and purchase in pairs. Keeping a spare pair means zero downtime after replacing a damaged set.

Where to Buy

Find compatible replacement parts from these retailers:

Check price for dolphin filter on Amazon

Frequently Asked Questions

What type of filter does the Dolphin M400 use?

The M400 uses two rigid cartridge filter baskets with a mesh screen. They are accessed via the top-load panel on top of the robot.

How do I clean the Dolphin M400 filter?

Remove both baskets from the top-load panel. Rinse each with a garden hose on both sides until the water runs clear. Let dry before storing or reinstall after rinsing.