9991433-R4 Spring Cartridge Filter Panels, Maytronics Part Number: 9991432-R4.Replacement filters work with the following Dolphin Robotic Pool Cleaners: for Nautilus CC Plus( Not for Nautilus CC), M400, M500, Sigma, Odyssey, Oasis Z5i, Triton Plus (old), Aquarius XL, C3, C4.It's dimension is 10-1/2inch x 6-3/8inch.Lightweight design makes the process of replacing filters a breeze, so you and your family can maintain healthy and pure air in every room. A fresh filter will help remove irritants and neutralize odors.Filter canintercept dust,leaves,diatoms,hair, effectively filter to reject secondary pollutionThe heart of the pool cleaner is the filters. Keep them clean and replace when they are worn or to dirty to clean. filter will improve the cleaning performance of your device:Remove 99.9% of particles including odors, smoke, pet dander, dust, and more down to 0.1 Micrometre in size. Captures finer particles than HEPA H11 (0.3 Micrometre).ABS plastic frame pleated fiber filter,solid and durable,washable and reusable,last for 2-3 years long service life.Please rinse the filter every 4-6 weeks for optimal performance.[Advantages]: 1.The Energy-Hog pool pump does NOT need to run. 2. The robotic pool cleaner scrubs the sides as well as the pool floor.Fine mesh filter,they pick up the fine dirt from the water also. Very easy to clean. 3. The micro-screen filter cleans up silt, sand, grass trimmings, pet hair, and even pine needles colour: black + whiteMaterial: PlasticPackage Contents:8 x pool filtersOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.