Tier1 Spa Filter Replacement for Waterway 817-4050 — 4-Pack High-Flow Pleated Cartridges

If your spa uses Waterway-style cartridges and you need reliable filtration without the hassle of custom sizing, this four-pack from Tier1 gives you ready-to-install replacements engineered for compatibility and performance. These cartridges match the common Waterway 817-4050 form factor and comparable aftermarket part numbers so they slide into existing filter housings with no modification. Built with a high-flow internal core and advanced pleated media, they balance filtration efficiency and pump protection for everyday spa use.

Will these cartridges fit my Waterway 817-4050 or equivalent filter housing?

Yes — the Tier1 cartridges are sized to match the typical Waterway 817-4050 profile so they fit most compatible housings. Verify your existing cartridge dimensions before ordering to ensure exact compatibility.

• Overall length: 13-1/16 inches for proper seating.
• Outer diameter: 5 inches to match standard housings.
• Compatible cross-reference numbers: Teleweir 50, Pleatco PWW50L series, Filbur FC-0172, Unicel 4CH-949 and others.
• Sold as a 4-pack to replace multiple units at once.

How does the filter media capture dirt while keeping flow steady?

These cartridges use trilobal-shaped fibers rather than simple round fibers, which increases surface contact and particle capture without overly restricting water movement. The pleated construction provides large surface area and the supported internal core lets water pass through freely to your pump and heater.

• Trilobal dirt-lock fibers trap more fine particles, hair, and debris.
• Pleated design increases filtration area for longer run times between cleanings.
• High-flow internal core protects pump performance and reduces pressure drops.
• Engineered to balance cleanliness and consistent circulation.

Are these cartridges tested for durability and performance?

Tier1 cartridges are independently evaluated to industry filtration protocols to verify performance and robustness. That testing helps ensure the cartridges hold pleat shape, resist premature collapse, and deliver expected water clarity under typical spa conditions.

• Independently tested to NSF 50-related protocols for performance benchmarks.
• Constructed to resist distortion and maintain consistent filtration over service life.
• Designed to avoid leakage or gaps that reduce effectiveness.

How do I benefit from buying a four-pack versus single cartridges?

Buying a four-pack gives you immediate spares for staggered replacement schedules and reduces the frequency of repeat orders. It’s economical for homeowners who maintain multiple spas or prefer to swap all cartridges at once during seasonal service.

• Four cartridges in one purchase for convenience and value.
• Keep one spare on hand to avoid downtime during replacements.
• Ideal for multi-spa properties or scheduled full-filter changes.
• Consistent filter media across replacements for predictable performance.

Who is this for? Homeowners, property managers, and spa technicians who use Waterway 817-4050 or cross-referenced filter housings and want a dependable, easy-to-install replacement that improves particle capture without sacrificing circulation. Choose Tier1 when you need a pack of premium, dimension-matched cartridges to maintain water clarity and protect spa equipment between cleanings.