Maytronics Dolphin Supreme M5 filter and cartridge holder - 9980733

Maytronics Dolphin Supreme M5 filter and cartridge holder

This is the OEM internal frame that locates and retains the filter cartridge or filter bag inside the Dolphin’s filter housing. Without a intact holder the cartridge shifts under water flow, gaps open around the filter media, and debris bypasses filtration entirely and re-enters the pool.

What this cartridge holder does in the Dolphin

The holder slots into the filter bay and cradles the cartridge so it sits flush against the housing walls. It keeps the filtration media under even pressure from the pump flow, ensuring all water drawn in passes through the cartridge rather than around it. When the holder cracks, warps, or loses its clip engagement, filtration efficiency drops immediately and visibly — the water returned to the pool turns cloudy and fine debris accumulates on the pool floor.

Which Dolphin models it fits

Part 9980733 covers a broad platform of Dolphin robotic cleaners sharing the same filter-bay architecture. Confirmed compatible models include: Supreme M4, Supreme M5, Liberty, Wave 65, Wave 90, Bio PVC, C3, C4, M400, Triton Plus, Dynamic Oasis, Z5, and Dynamic C3. Always cross-reference your unit’s part diagram before ordering if you are unsure of your exact variant.

Signs it needs replacing

Inspect the holder every time you pull and rinse the cartridge. Look for stress cracks along the side rails, broken or deformed locking tabs, and any bowing of the frame that prevents the cartridge from sitting flat. A cartridge that slides loose or rattles during a cleaning cycle is a reliable indicator that the holder’s retention features have failed. Do not tape or cable-tie a damaged holder — the fix takes minutes and the OEM part is inexpensive.

How to install it

Open the filter-access door or hatch on top of the Dolphin. Remove the spent cartridge and slide the old holder straight out — no tools needed. Drop the new holder into the bay, ensuring the alignment tabs click into the slots on the housing walls. Reinsert the cartridge, close the door, and the robot is ready to run. The whole swap takes under five minutes.