[Microfiltration ]The Filter Cartridges are designed to only trap larger debris and let fine debris pass through to prevent the cartridges from being clogged as quickly when the pool is especially dirty [Multi-version Compatible Use] water filter Perfect for Dolphin Robotic Pool Cleaners: S50 Active 10 , Part Number: 9991460-R1. [Durable] plastic frame, more sturdy and durable. It firmly supports the filter layer and prevents it from breaking during work. same as the model number 9991460-R1. [INSTALLATION REDMIND] If properly used, these ultra-fine filters can last 2-3 years. Please rinse the filter every 4-6 weeks for optimal performance Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Material: plastic colour: As Shown Package Contents: 1 x Ultra Fine Filtration Basket Only the above package content, other products are not included. Note: Light reflection 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.