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 filters are essential for optimal pool cleaner performance. A clean filter improves device efficiency and water quality. 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. Designed for a long service life of 2–3 years. Rinse the filter every 4–6 weeks to maintain optimal performance. Fine mesh construction effectively traps fine dirt, silt, sand, grass clippings, pet hair, and pine needles. The robotic pool cleaner scrubs pool walls and floor for thorough cleaning. Color: black + white. Material: plastic. Package includes: 8 x pool filters. Package content limited to items listed; other products not included. Note: Lighting and display differences may cause slight color variations between image and actual item. Measurement allowance: +/- 1–3 cm.