General description High Efficiency Pool Filter: This set of 4 ultra-fine filter cartridges is designed for optimal cleaning performance, effectively removing dirt and debris such as leaves, dust, and diatoms from your swimming pool, ensuring it remains flawless. Technical specifications Model: 991432-R4 Material: ABS plastic frame for enhanced durability Filter lifespan: 2-3 years with proper use Compatibility and accessories Compatible with Dolphin M400 and M500 models Same model as 9991432-R4 Usage For best performance, rinse the filter every 4-6 weeks to maintain its efficiency.