AQUIVEX PLBS75 Spa Filter Cartridge 75 sq.ft. (2-Pack) — 14.75" x 5.31" Replacement for Pentair/Unicel, Trilobal Fiber

The AQUIVEX PLBS75 is a 75 sq.ft. replacement spa filter cartridge designed to trap fine particles and fit popular top-load spa housings, sold here as a convenient 2-pack.

Built to replace Pentair R173600, Unicel C-5374 and many other common models, this AQUIVEX cartridge combines a large filtration area with durable construction to keep spa water clearer between maintenance cycles. Its 14 3/4" length and 5 5/16" outside diameter are compatible with a wide range of hot tub brands and models. The cartridge uses advanced trilobal fibers and a reinforced core to increase dirt-holding capacity while resisting deformation under normal use.

How well does this cartridge capture debris?

The PLBS75 captures particles down to about 10–15 microns, which covers common spa contaminants like hair, fine sediment, skin oils and plant debris. Its large 75 square-foot surface area gives more room for solids to lodge without quickly restricting flow.

• Rated filtration area: 75 sq.ft.
• Particle capture: approximately 10–15 microns
• Effective for hair, dust, sand, leaves and fine sediment
• Trilobal fibers increase capacity compared with standard point-bond fabric

Will it fit my spa—what are the exact dimensions and cross-compatibilities?

Measure your current cartridge and compare to the AQUIVEX dimensions: length 14 3/4", outside diameter 5 5/16", top and bottom openings 2 1/8". This cartridge is intentionally produced to match many common OEM parts for simple, drop-in replacement.

• Length: 14 3/4"
• Outside diameter: 5 5/16"
• Top opening: 2 1/8" • Bottom opening: 2 1/8"
• Compatible with Pentair R173600, Unicel C-5374, Pleatco PLBS75 and many other cross-reference numbers

How durable and easy to maintain is the cartridge?

AQUIVEX designed the PLBS75 with break-resistant end caps and a solid core support to reduce the risk of cracking or collapsing during normal handling and use. Cleaning is straightforward: hose it off or soak in filter cleaner when flow slows or debris builds up.

• Reinforced core and durable end caps for structural integrity
• Hose-cleanable and compatible with soak-in cleaning solutions
• Maintains filtration capacity without excessive pressure drop

Which spa brands and filter models are supported?

This cartridge is manufactured to replace a long list of OEM part numbers so you can match it with many hot tub and spa systems. It's suitable for both direct replacements and as a universal alternative when the dimensions and openings match your housing.

• Cross-compatible with Aladdin 17540, Baleen AK-40081, Darlly 50651, Filbur FC-2971, and more
• Works in systems from Leisure Bay, Maax Spas, Pentair, Waterway Plastics and others
• Sold as a handy 2-pack to keep a spare cartridge on hand

Who this is for: The AQUIVEX PLBS75 2-pack is ideal for hot tub owners, pool service technicians and property managers who need a dependable, high-capacity top-load spa filter that matches common OEM sizes. Choose this cartridge if you want a cost-effective replacement that balances strong dirt-holding performance with easy maintenance—especially suitable when you prefer to keep a backup cartridge ready between cleaning cycles.