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, Odyssey, 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 fine debris, preventing secondary pollution. The filters are essential for optimal pool cleaner performance. Clean or replace filters when worn or difficult to clean to ensure maximum efficiency. Effectively removes 99.9% of particles including dust, pet dander, smoke, odors, and other contaminants down to 0.1 micrometer in size. Captures finer particles than HEPA H11 rated at 0.3 micrometers. Features an ABS plastic frame with pleated fiber filtration media. Durable, washable, and reusable design supports a service life of 2–3 years. Rinse the filter every 4–6 weeks for best performance. Fine mesh construction effectively traps silt, sand, grass clippings, pet hair, and pine needles. Robotic pool cleaner efficiently scrubs pool walls and floor without requiring the main pool pump to run. Color: Black + White. Material: Plastic. Package includes: 8 x Pool Filters. Light shooting and different display settings may cause slight color variations between the image and actual item. Measurement may vary by +/- 1-3 cm.