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Durable materials and proven designs support long-term serviceability in busy pool and spa environments
safe outdoor spaces
Compatible with Napoleon direct vent propane systems
Laing has a long-standing reputation in spa pump solutions
it’s ideal for homeowners and professional technicians who value reliable
Pentair CNC Plus 520 Replacement Filter Cartridge | R173578 Aluminum Durable materials and proven designsWhat 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
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