Fiitzn Ultra Fine Filtration Basket Compatible with Dolphin Robotic Pool Cleaners: S50, Active 15, Echo, Nautilus CC, Encore, E10, E20, Proteus DX3,Solo, Advantage.Maytronics Part Number: 9991460-R1Brand: Fiitzn Features: [Microfiltration Technology]The Spring Filter Cartridges are designed to only trap larger debris and let fine debris pass through to prevent the cartridges from being clogged as quickly when the pool is especially dirty [Multi version Compatible Use] Fiitzn water filter Perfect Compatible with the following Dolphin Robotic Pool Cleaners: S50, S100,Active 15, Echo, T15, Proteus DX3,E20, Cayman, Escape, Nautilus CC, Encore, E10,