Maytronics Dolphin EX45 fine filter assembly M line - 9991428-ASSY

Maytronics Dolphin EX45 fine filter assembly M line

This is the genuine Maytronics fine filter assembly for the M line cartridge system, designed to trap fine debris from pool water passing through the robot’s filtration chamber. Sold as a single unit, two assemblies are required per robot for a complete filter load. It is a direct OEM replacement part carrying the full Maytronics quality guarantee.

How the fine filter assembly works

The M line filter assembly sits inside the robot’s cartridge housing and intercepts fine particulate matter — including small sand grains, algae spores, and dust — that would otherwise pass through a standard filter. The pleated or mesh filter medium maximises surface area to maintain strong suction flow while capturing debris efficiently throughout the cleaning cycle.

Compatible Dolphin models

This assembly is compatible with a wide range of Dolphin robots from the M line platform, including the Dolphin EX45, Dolphin M400, Dolphin Nautilus CC Plus, Dolphin Nautilus CC Supreme, Dolphin Sigma, Dolphin Evolution 40/50/60, Dolphin EX60, Dolphin Swell M, Dolphin Swell MX, Dolphin Wave 80, Dolphin C5 PRO, Dolphin KAPTUR 150/400/500, Dolphin DIVER PRO 150/400/500, Dolphin Zenit 15/20, Dolphin Maximus X70/X90, and many more. Always verify your robot’s model number before ordering.

Signs the filter assembly needs replacing

Replace this part when you notice reduced suction or water flow from the robot, visible tears, clogging that cannot be cleared by rinsing, or filter panels that no longer seat correctly in the cartridge frame. A degraded filter will allow fine debris to bypass the filtration system and return to the pool water.

Why genuine Maytronics parts matter

Aftermarket filter assemblies frequently use lower-grade mesh materials that deform under pump pressure, reducing filtration efficiency and risking debris bypass. Genuine Maytronics parts are manufactured to the exact tolerances of the M line cartridge housing, ensuring a leak-free seal, correct flow resistance, and compatibility with the robot’s motor load. Using non-genuine parts may also void your Maytronics warranty.