8Pack R4 Ultra Fine Filters Replacement for Dolphin Active 20/M600/S300 Pool Cleaner 9991467-R4 Ultra Fine Filter for Dolphin Active 20, Pleated Pool Cleaner Replacement Parts (8Pack) Compatible with Dolphin Robotic Pool Cleaners: Active 20, Active 30, Active 30i, Active 40, Active 60, Advantage Ultra (new), Explorer E30, Explorer E50, Explorer E70, M600, Mercury, Premium, DX4, DX5i, Prowler 920, Prowler 930, Prowler 930W, Quantum, S200, S300, S300i, S400, T35, T45, T55i, Triton PS, Triton PS Plus, Warrior SE, Warrior SI. Part number: 9991467-R4. Installation is simple and straightforward. Each filter panel is numbered to match its position in the hanging basket, ensuring correct placement. It is recommended to remove and replace the filters in numerical order, starting from 1 to 4 or 4 to 1, for easy replacement. The filter features a sturdy plastic frame that securely supports the filtration layer, preventing damage during operation. The ultra-fine filtration consists of three layers with a thick pleated design similar to HVAC filters, providing a larger surface area for improved debris capture. The waffle-like texture and fine mesh enhance the pool cleaner’s efficiency in collecting dirt and particles. This package includes two complete sets of filters (8 filters total), compatible with Dolphin model 9991467-R4. Color: in photo Material: Plastic Package Contents: 2 x 9991467-R4 Ultra Fine Filter sets (8 filters total) Note: Light reflection and different displays may cause slight color variations. The physical product may have minor color differences, which do not affect performance. Measurement may vary by +/- 1-3 cm. Only the items listed are included.