The Maytronics 9991463-R4 Dolphin Spring Filter Kit is designed to work with Dolphin Robotic Pool Cleaners, providing effective filtration that prevents clogging of the cartridges. The kit contains four spring cartridge filters, trapping larger debris while allowing tiny particles to pass through. 
Easy installation
Easy emptying & cleaning
Traps larger debris
Fitment guidelines:
For use with different Dolphin Pool Cleaners such as Active 20, Active 30, Active 30i, S200, S300i, Triton PS, Triton PS Plus, Prowler 920, Prowler 930, Discovery, Premium, Quantum, T55i, T45, Proteus Dx5i, and Mercury