9991433-R4 Spring Cartridge Filter Panels, Maytronics Part Number: 9991432-R4. Replacement filters compatible with the following Dolphin Robotic Pool Cleaners: Nautilus CC Plus (not for Nautilus CC), M400, M500, Sigma, , Oasis Z5i, Triton Plus (old), Aquarius XL, C3, C4. Dimensions: 10-1/2 inches x 6-3/8 inches. Lightweight design allows for easy filter replacement. Helps maintain clean and healthy pool water by capturing dust, leaves, diatoms, hair, and other debris, preventing secondary pollution. The filter is essential for optimal pool cleaner performance. Removes 99.9% of particles including odors, smoke, pet dander, dust, and more down to 0.1 micrometer in size. Captures finer particles than HEPA H11 (0.3 micrometer). Features an ABS plastic frame with pleated fiber filtration media. Durable, washable, and reusable design with a service life of 2–3 years. Rinse the filter every 4–6 weeks for best performance. Fine mesh construction effectively traps fine dirt, silt, sand, grass clippings, pet hair, and pine needles. The robotic pool cleaner scrubs both pool walls and floor without requiring additional pump operation. Color: black + white. Material: plastic. Package includes: 8 x pool filters. Note: Light shooting and different displays may cause slight color variation between the image and actual item. Measurement allowance: +/- 1–3 cm.