Product Overview

The C-9431 cartridge is a high-capacity replacement element specifically designed for the AquaStar Pipeline series filter model PLF35000. This unit features approximately 250 sq ft of filtration media and supports high-flow, large-volume pool applications. It restores cartridge filter performance by replacing worn or inefficient media, offering improved water clarity and extended service intervals.

Ideal For

• Pool owners with the AquaStar Pipeline PLF35000 filter whose cartridge media is aged, torn, or showing high pressure drop.

• Service technicians recommending a full-sized replacement cartridge for large residential or light commercial pools.

• Installations requiring a cartridge size that supports high flow rates (up to ~200 GPM) and heavy debris loads. 

• Systems where cartridge condition affects pump loading, flow efficiency, and water clarity.

Key Features

• 250 sq ft of Filtration Media – large pleated surface area for extended performance and fewer clean-outs. 

• Designed for PLF35000 Filter Model – matched dimensions and specifications for drop-in replacement. 

• Durable Construction – built with premium materials for long service life and durability under heavy-use conditions. 

• Improves Flow Efficiency – reduces pressure drop and enables cleaner water circulation by replacing worn media. Large Format Cartridge – optimal for large pools (up to ~144,000 gallons turnover capacity) and high-flow systems. 

Customer-Facing Q&A

Q: How do I know if I need this cartridge replacement?
A: If you notice over-pressurization, reduced flow, longer filter cycles, or if your current cartridge is dirty, torn, or worn out, a replacement is recommended.

Q: Will this cartridge fit my filter housing?
A: Yes—this part is designed for use with the AquaStar Pipeline PLF35000 filter. Confirm you have the PLF35000 model before ordering.

Q: How often should I replace the cartridge media?
A: Replacement frequency depends on usage, pool load, and maintenance, but typically every 1-3 seasons for large filters under heavy use.

Q: Can I clean my existing cartridge instead of replacing it?
A: Yes. Cleaning prolongs life, but if the media is damaged, heavily stained, or pleats are collapsed, replacement offers restored performance and flow.

Q: Does installing a new cartridge improve my pool’s circulation and clarity?
A: Yes. Fresh media offers better filtration, lower pressure drop, improved flow and can contribute to clearer water and more efficient operation.