- Compatible design for Dolphin pool cleaners including DX3 and DX4. The 9991422-R4 filter panels are designed with exact specifications to fit your original equipment, ensuring seamless integration and continued high efficiency and crystal-clear water. - Enhanced filtration technology: ultrafine filter panels capture microscopic particles and fine debris that standard filters may miss. This advanced filtration helps keep water clear and reduces chemical use. The panels trap particles as small as 2 micrometers, keeping your pool ready for the season. - Durable construction: built from robust plastic resistant to pool chemicals and constant water exposure, these filter panels maintain integrity with regular use. The reinforced design withstands continuous cleaning cycles without warping or breaking. This rugged construction means less replacement and more consistent cleaning over multiple seasons. - Easy installation: replace worn filters in minutes with our user friendly design. No tools or technical knowledge required—simply remove the old front plate and snap in the new one. The intuitive process gets your pool cleaner back in action quickly, minimizes downtime, and keeps your maintenance routine on track. Each filter panel installs securely to ensure proper function. - Use scenarios: - After heavy wind or pollen season, when fine particles accumulate, these panels help maintain water clarity by capturing small debris. - In saltwater or chemically treated pools, they reduce chemical demand while preserving a pristine pool. - Upgrading older Dolphin cleaners to ultrafine filtration (DX3/DX4) for improved debris capture and longer maintenance intervals.