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 capture dust, leaves, diatoms, hair, and fine debris, effectively preventing secondary pollution. Maintaining clean filters enhances the overall cleaning performance of your pool cleaner. Filters remove 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). 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 to maintain optimal performance. Fine mesh construction effectively traps silt, sand, grass clippings, pet hair, and pine needles. The robotic pool cleaner scrubs both pool walls and floor. Energy efficient operation reduces the need for continuous pool pump use. Color: black + white. Material: Plastic. Package includes: 8 x pool filters. Product does not include any additional items shown in images. Note: Lighting and display differences may cause slight color variations between image and actual product. Measurement tolerance: +/- 1–3 cm.