Choosing the right replacement filter cartridge for your Waterway pool pump keeps water crystal-clear, reduces chemical use, and extends the life of your circulation system. This guide covers ten popular Waterway and TWM cartridge models — from compact top-load cartridges to high-area Crystal Water designs — and explains their filtration capacity, expected lifespan, standout features, compatible third-party options, and clear replacement cues. Whether you’re maintaining a residential pool, spa, or commercial system, selecting the correct square-foot rating and cartridge style ensures proper flow rate and filtration efficiency. Below you’ll find short, SEO-friendly sections on each cartridge model to help you compare performance, cost, and compatibility at a glance. For best results, match cartridge sq. ft. rating to your filter housing, inspect pleats for damage during each seasonal service, and choose OEM or reputable aftermarket replacements that use multi-layer polyester media. If you need exact OEM part cross-references, measurements, or filtered-area vs. flow charts for a specific filter tank, check the filter housing model or supplier listing before ordering. Use the recommendations below to help decide which replacement filter cartridge fits your pool’s size, budget, and maintenance cadence.
Waterway 817-0075PB / 817-0075NB — 75 sq. ft.
These 75 sq. ft. cartridges are ideal for smaller residential pools and many spa filter housings. They balance decent surface area with compact size for systems with limited space.
- Filtration capacity: 75 sq. ft. of pleated media — captures fine debris, improving clarity versus sand alone.
- Life span: Typically 1–3 years depending on water quality and maintenance (clean every 4–8 weeks).
- Important features: Multi-pleat polyester media, corrosion-resistant end caps, designed for Clearwater (PB) or ProClean Plus (NB) housings.
- Third-party options: Many aftermarket manufacturers produce compatible 75 sq. ft. cartridges—look for industry standards in micron rating and reinforced seams.
- When to replace: Replace when pleats are torn/flattened, persistent pressure rise despite cleaning, or after 1.5–3 years of use.
Waterway 817-0100PB / 817-0100NB — 100 sq. ft.
100 sq. ft. cartridges suit medium residential pools and give improved run time between services while maintaining good flow.
- Filtration capacity: 100 sq. ft. — finer particulate capture and longer cycles than 75 sq. ft.
- Life span: 1.5–3 years with regular cleaning (every 4–8 weeks in moderate conditions).
- Important features: Higher media area for lower pressure rise, compatible with Clearwater and ProClean Plus housings.
- Third-party options: High-quality aftermarket cartridges available — choose ones with reinforced cores and validated sq. ft. ratings.
- When to replace: When flow drops or pressure increases and cleaning no longer restores performance, or visible media damage.
Waterway 817-0125PB / 817-0125NB — 125 sq. ft.
125 sq. ft. cartridges are a common upgrade for medium-to-large pools seeking longer service intervals and enhanced filtration.
- Filtration capacity: 125 sq. ft. — improved dirt holding and longer filter cycles.
- Life span: 2–4 years with correct cleaning and winter storage procedures.
- Important features: Deep pleat design, sturdy core to resist collapse, optimized for Clearwater / ProClean Plus systems.
- Third-party options: Many aftermarket brands produce high-capacity 125 sq. ft. cartridges; check reviews for longevity and warranty.
- When to replace: Persistent high filter pressure after cleaning or visible deterioration of pleats or end caps.
Waterway 817-0150PB / 817-0150NB — 150 sq. ft.
150 sq. ft. cartridges work well for larger residential pools or pools with heavier bather loads — they reduce maintenance frequency and chemical demand.
- Filtration capacity: 150 sq. ft. — offers extended dirt capacity and slower pressure build-up.
- Life span: 2–4 years under typical conditions; more with careful cleaning.
- Important features: High surface area pleats, robust core design for consistent flow, suited to Clearwater/ProClean Plus housings.
- Third-party options: Aftermarket 150 sq. ft. cartridges are common; prefer reinforced media and clear compatibility notes.
- When to replace: When cleaning doesn’t restore original pressure or when pleats show wear or mold buildup.
Waterway 817-0200PB / 817-0200NB — 200 sq. ft.
200 sq. ft. cartridges are targeted at larger systems or pools with heavy organic load — they maximize dirt holding while maintaining flow.
- Filtration capacity: 200 sq. ft. — long service intervals and high debris capacity.
- Life span: 2–5 years depending on maintenance and water conditions.
- Important features: Extra pleat area reduces frequency of cleanings and lowers peak filter pressure.
- Third-party options: Available from reputable aftermarket suppliers; verify core strength and true sq. ft. claims.
- When to replace: Replace when pleats compress, media separates from end caps, or performance drops despite cleaning.
Crystal Water 817-0081B — 325 sq. ft.
Crystal Water high-area cartridges are built for maximum dirt-holding — the 325 sq. ft. model is excellent for pools aiming for very long filter cycles and minimal maintenance.
- Filtration capacity: 325 sq. ft. — designed for extended run times and superior clarity.
- Life span: 3–6 years with proper cleaning and seasonal care.
- Important features: Very high pleat count, heavy-duty core, engineered for low pressure rise and high flow retention.
- Third-party options: Fewer aftermarket exact matches; choose vendors that specify true sq. ft. and use premium polyester media.
- When to replace: When pleats are irreparably fouled, the core shows fatigue, or water clarity declines despite service.
Crystal Water 817-0106B — 425 sq. ft.
The 425 sq. ft. Crystal Water cartridge is a premium, ultra-high-area option for owners who want the longest possible cleaning intervals and the finest particulate capture.
- Filtration capacity: 425 sq. ft. — exceptional dirt storage and long maintenance intervals.
- Life span: 3–7 years with good cleaning practice and low-chemical stress.
- Important features: Massive pleat area, reinforced core for pressure stability, engineered for commercial or heavy residential use.
- Third-party options: Limited; when available, select premium aftermarket brands with performance guarantees.
- When to replace: When structural integrity is compromised or when cleaning no longer reduces filter pressure sufficiently.
Crystal Water 817-0131B — 525 sq. ft.
At 525 sq. ft., this Crystal Water cartridge is among the highest-area consumer cartridges — ideal for very large pools, waterparks, or commercial settings requiring top filtration performance.
- Filtration capacity: 525 sq. ft. — exceptional for handling large bather loads and heavy debris.
- Life span: 3–8 years in ideal conditions with regular cleaning and inspection.
- Important features: Maximum media area, heavy-duty construction, designed to minimize backwashing and extend pump run time efficiency.
- Third-party options: Rare — prioritize OEM or well-established aftermarket suppliers with clear specifications.
- When to replace: When pleats flatten irreversibly, cores crack, or pressure patterns indicate lost capacity.
TWM 817-2500B — Top Load 25 sq. ft.
Compact top-load cartridges like the TWM 25 sq. ft. are common in small filters and compact pool/spa applications where space and simplicity matter.
- Filtration capacity: 25 sq. ft. — suitable for small filter housings and lower flow pumps.
- Life span: 1–2 years depending on usage; frequent cleaning recommended in dirty environments.
- Important features: Top-load friendly length, quick-change design, economical replacement cost.
- Third-party options: Widely available; many compatible replacements marketed for top-load housings.
- When to replace: Replace when pleats are clogged beyond cleaning or when the cartridge is physically damaged.
TWM 817-5000B — Top Load 50 sq. ft.
The 50 sq. ft. TWM top-load cartridge provides more media area while retaining the convenience of top-load access — a good middle ground for small-to-medium systems.
- Filtration capacity: 50 sq. ft. — improved dirt holding and longer intervals than 25 sq. ft.
- Life span: 1.5–3 years with routine cleaning.
- Important features: Easy top access, balanced between compact size and media area, economical for many residential setups.
- Third-party options: Common—ensure the aftermarket product matches length, diameter and end-cap style for your housing.
- When to replace: When cleaning doesn’t restore flow or physical wear is apparent on ends or pleats.
Technical Details
Below are typical technical characteristics for Waterway / Crystal Water / TWM replacement cartridges. Exact dimensions and materials can vary by part number and manufacturer—always confirm measurements with your filter housing or OEM spec sheet before ordering.
- Media material: Multi-layer spunbond polyester or pleated polyester fabric (standard for pool cartridges). Some premium cartridges use higher denier polyester or bonded media for longer life.
- Core: Heavy-duty plastic or polymer core with structural ribs to prevent collapse under pressure.
- End caps: Injection-molded plastic or thermoplastic with seal features; some models use gaskets or O-rings for improved sealing.
- Typical micron rating: Effective particle capture in the 20–50 micron range (varies by media density and pleat count).
- Dimensions: Top-load cartridges (25–50 sq. ft.) commonly range ~6–10″ length and 3–6″ diameter; larger pleated cartridges (75–525 sq. ft.) vary widely — lengths often 8–20″ and diameters 4–8″. Always verify exact length, outer diameter, inner core diameter, and end-cap style for compatibility.
- Compatibility tip: Match square footage, overall length, outer diameter, and end-cap/center-core style to your filter housing; when in doubt, note the housing model and check OEM cross-reference charts.
Conclusion: Choosing the right replacement filter cartridge for your Waterway pump comes down to matching sq. ft. capacity to your pool size and bather load, keeping the cartridge clean, and replacing it when cleaning no longer restores performance. For small pools use 25–100 sq. ft. cartridges; for larger systems or heavy use, prefer 150–525 sq. ft. high-area cartridges. When purchasing, favor OEM parts or reputable aftermarket brands that clearly list dimensions and media specs to ensure a perfect fit and long service life.
For more Replacement Filter Cartridges and other Waterway Products, visit Waterway Store on Amazon and Waterway Website