AQUALTRA Hot Tub Filter Cartridge FC-2402 Replacement 9 3/8" x 5 1/4" 1½" MPT Thread, 2-Pack — Washable NSF-Grade Pleated Media

AQUALTRA FC-2402 is a washable, NSF-material spa filter cartridge designed to replace FC-2402/303279-style filters and trap hair, leaves, sand, and sediment for clearer hot tub water.

Keep your hot tub or small pool running efficiently with replacement cartridges built to the same size and thread specification as many OEM parts. These two-pack AQUALTRA filters measure 9 3/8 inches long with a 5 1/4 inch outer diameter and a 1½" MPT threaded base, so they fit systems that accept FC-2402-style cartridges. Constructed from BPA-free materials certified to NSF/ANSI standards, they balance durability with easy maintenance.

How do these cartridges improve water clarity?

The cartridge media is engineered to hold more debris than basic filter fabrics, catching particles that degrade water quality. Regular exchange or cleaning helps the circulation system move water freely and reduces strain on the pump. These filters remove common contaminants without altering your sanitizer routine.

• High-capacity pleated media captures fine sediment, hair, and leaves.
• Polypropylene core supports steady flow under pressure.
• Threaded 1½" base secures a tight fit to stop bypassing.

Are these AQUALTRA cartridges compatible with my spa model?

These cartridges are sized to match many popular replacement part numbers — outer diameter 5 1/4" and length 9 3/8" with a closed top and string handle and a 1½" MPT threaded bottom. They are compatible with a range of Watkins and other OEM cross-references when physical dimensions and thread type are the same. Always compare dimensions and connection types before purchase.

• Fits cartridges with dimensions 9 3/8" L x 5 1/4" OD and 1½" MPT base.
• Works as a replacement for common part numbers used in Watkins systems.
• Note: Manufacturer names are listed for compatibility guidance only.

How do I maintain and clean these spa filters?

The cartridge material is washable and built for multiple cleanings, preserving performance for many cycles when cared for properly. Rinse with a hose every two weeks under typical use, and soak periodically with a filter cleaner for deeper removal of oils and scale. Remove the filter before using strong chemicals or hot cleaning solutions to prevent corrosion of threaded fittings.

• Rinse debris with a garden hose; avoid high-pressure washers close-up.
• Soak in a non-bleach filter solution for heavy oils or scale build-up.
• Reinstall dry and inspect end caps and threads for wear.

What materials and safety standards are used in these cartridges?

Each cartridge uses a PET-based pleated media with a sturdy polypropylene center core and chlorine-resistant end caps, all free from BPA. These components meet NSF/ANSI criteria for pool and spa materials, giving you reassurance about material safety and chemical compatibility. The construction is selected to resist common spa chemicals and provide consistent filtration over repeated cleanings.

• BPA-free PET media for efficient particle capture.
• Chlorine-resistant end caps and polypropylene core for durability.
• Manufactured to meet recognized NSF/ANSI material standards.

Who is this for? If you own a hot tub, portable spa, or small swim spa that accepts 9 3/8" x 5 1/4" cartridges with a 1½" MPT threaded base, and you want a reusable, NSF-material replacement that traps finer debris and is easy to clean, this two-pack from AQUALTRA is a practical choice. It suits homeowners and service technicians who prioritize consistent filtration, straightforward maintenance, and verified material safety. Always verify your hot tub's filter dimensions and thread type before ordering to ensure proper fit.