Pentair R173578 Cartridge Replacement - CNC Plus 520

What This Part Is Used For
Pentair R173578 Cartridge Replacement - CNC Plus 520 is a replacement filter cartridge for Clean and Clear Plus 520 filtration systems. It removes debris and fine particles during normal circulation.

Why This Part Matters
A clogged or aging cartridge reduces filtration performance and increases system pressure. Replacing it restores proper water clarity and balanced flow. Clean cartridges help protect pumps and heaters from strain.

Key Features and Specifications

• Manufacturer part number: R173578
• Replacement cartridge element
• For Clean and Clear Plus 520 filter systems
• Cartridge style filtration
• Removes suspended debris
• Confirm exact filter model before ordering

Installation and Fitment Guidance
Relieve filter pressure and remove the tank lid before replacing the cartridge. Inspect lid O-ring and sealing surfaces during service. Confirm by manufacturer part number before ordering.

About the Pentair Brand
Pentair manufactures high capacity cartridge filters widely installed in residential pools. Their Clean and Clear Plus series supports strong water clarity with minimal maintenance. Pentair provides OEM cartridges for consistent performance. The brand is trusted by pool professionals.

Common Service Context
This cartridge is typically replaced when filter pressure rises after cleaning. It is also installed during routine seasonal maintenance.