1. Multiversion Compatible Use The water filter is perfectly compatible with the following Dolphin Robotic Pool Cleaners: Active 20, Active 30, Active 30i, Active 40, Active 60, Advantage Ultra, Discovery (), Explorer E30, Explorer E50, Explorer E70, M600, Mercury, Premium, Proteus DX4, Proteus DX5i, Prowler 920, Prowler 930, Prowler 930W, Quantum, S200, S300, S300i, S400, T35, T45, T55i, Triton PS, Triton PS Plus, Warrior SE, Warrior SI. Part number: 9991467R4. 2. It has an ABS plastic frame, which is more sturdy and durable. It firmly supports the filter layer and prevents it from breaking during work. 3. Solid Structure It features thick pleated fabric with a strong plastic support frame that can hold its shape and is not easily deformed when pool water flows through. 4. Long Lasting It is easy to clean with a garden hose for reuse, greatly extending the life of the filter. Make sure to rinse the filter every 4 6 weeks for optimal performance.