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, , Oasis Z5i, Triton Plus (old), 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 to prevent secondary pollution. The filters are essential for optimal pool cleaner performance. Effectively removes 99.9% of particles including odors, smoke, pet dander, dust, and other contaminants down to 0.1 micrometre in size. Captures finer particles than HEPA H11 (0.3 micrometre). Constructed with an ABS plastic frame and pleated fiber media for durability. Washable and reusable design offers a long service life of 2-3 years. Rinse the filter every 4-6 weeks for best performance. Features: 1. The robotic pool cleaner operates independently; pool pump does not need to run. 2. Cleans pool walls and floor with fine mesh filter that captures fine dirt. Easy to clean. 3. Screen filter effectively traps silt, sand, grass clippings, pet hair, and pine needles. Color: Black + White. Material: Plastic. Package Contents: 8 x Pool Filters. Note: Light and display settings may cause slight color variation between the image and actual item. Measurement allowance: +/- 1-3 cm.