Pentair R173576 Cartridge Replacement - CNC Plus 420

What This Part Is Used For
Pentair R173576 Cartridge Replacement - CNC Plus 420 is a replacement filter cartridge for Clean and Clear Plus 420 systems. It filters circulating pool water to remove debris and suspended particles.

Why This Part Matters
Over time, cartridges lose efficiency and restrict system flow. Installing a new cartridge restores proper filtration and consistent turnover rates. Clean filtration supports balanced water chemistry and equipment longevity.

Key Features and Specifications

• Manufacturer part number: R173576
• Replacement cartridge element
• For Clean and Clear Plus 420 filter systems
• Cartridge filtration design
• Captures debris and fine particles
• Confirm exact filter model before ordering

Installation and Fitment Guidance
Turn off pump and relieve pressure before removing the filter lid. Inspect internal components and clean the tank before installing the new cartridge. Confirm by manufacturer part number before ordering.

About the Pentair Brand
Pentair produces cartridge filtration systems used throughout residential and commercial pools. Their Clean and Clear Plus series is common on professional service routes. Pentair maintains strong distribution of OEM cartridges. The brand is recognized for dependable pool filtration.

Common Service Context
This cartridge is commonly replaced during annual service or when flow rates drop. It is also installed when upgrading from worn aftermarket elements.