Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.
31489 spa filter equivalents
Part number 31489 appears in 5 cross-reference rows below. Each row lists the OEM, Unicel and Pleatco numbers that the source documents treat as interchangeable, plus the cartridge size so you can confirm against your old filter.
The same numbers, on one page, are in the cross-reference lookup. A schedule for this part number, and the buy link, are on the replacement schedule and reorder page. Published intervals by brand are in the replace and clean calculator.
Hot Spring C-6330 cartridge (OEM 31489), 6" (152 mm) × 10-1/2" (267 mm), 30 sq ft. Unicel C-6330, Pleatco PWK30.
Unicel C-6330
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| OEM | 31489 |
|---|---|
| Unicel | C-6330 |
| Pleatco | PWK30 |
| Filbur | not listed |
| Size | 6" (152 mm) × 10-1/2" (267 mm), 30 sq ft |
Sources
- Unicel 2026 Replacement Guide: OEM cross reference (Hot Spring section), PDF p.39 (printed p.35); spec table PDF p.12 (printed p.8) (PDF)
- Pleatco 2023 Catalog: Unicel-to-Pleatco cross reference, PDF p.47 (PDF)
Not in sources: no Filbur equivalent found in Filbur catalog; no model/model-year fitment in sources.
Full details → · All Hot Spring spa filters · Which fitting you need · How to install it
Hot Spring C-6430 cartridge (OEM 31489), 6" (152 mm) × 10-1/2" (267 mm), 30 sq ft. Unicel C-6430, Pleatco PWK30-4.
Unicel C-6430 Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.
| OEM | 31489 |
|---|---|
| Unicel | C-6430 |
| Pleatco | PWK30-4 |
| Filbur | FC-3915 |
| Size | 6" (152 mm) × 10-1/2" (267 mm), 30 sq ft |
Sources
- Unicel 2026 Replacement Guide: OEM cross reference (Hot Spring section), PDF p.39 (printed p.35); spec table PDF p.12 (printed p.8) (PDF)
- Pleatco 2023 Catalog: Unicel-to-Pleatco cross reference, PDF p.47 (PDF)
- Filbur Catalog & Reference Guide: Product by Pool/Spa Manufacturer (OEM), Hot Springs, printed p.38 (PDF p.20) (PDF)
- Leisure Time Inc. (Hot Spring/Caldera dealer): Compatibility section: model and model-year list (web page)
- Leisure Time Inc. (Hot Spring/Caldera dealer): Compatibility section: model and model-year list (web page)
Full details → · All Hot Spring spa filters · Which fitting you need · How to install it
Hot Spot C-6430 cartridge (OEM 31489), 6" (152 mm) × 10-1/2" (267 mm), 30 sq ft. Unicel C-6430, Pleatco PWK30-4.
Unicel C-6430 Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.
| OEM | 31489 |
|---|---|
| Unicel | C-6430 |
| Pleatco | PWK30-4 |
| Filbur | FC-3915 |
| Size | 6" (152 mm) × 10-1/2" (267 mm), 30 sq ft |
Sources
- Unicel 2026 Replacement Guide: OEM cross reference (Hot Springs Spas section), PDF p.39 (printed p.35); spec table PDF p.12 (printed p.8) (PDF)
- Pleatco 2023 Catalog: Unicel-to-Pleatco cross reference, PDF p.47 (PDF)
- Filbur Catalog & Reference Guide: Product by Pool/Spa Manufacturer (OEM), Hot Springs, printed p.38 (PDF p.20) (PDF)
- Leisure Time Inc. (Hot Spring/Caldera dealer): Compatibility section: model and model-year list (web page)
- Leisure Time Inc. (Hot Spring/Caldera dealer): Compatibility section: model and model-year list (web page)
Full details → · All Hot Spot spa filters · Which fitting you need · How to install it
Solana C-6430 cartridge (OEM 31489), 6" (152 mm) × 10-1/2" (267 mm), 30 sq ft. Unicel C-6430, Pleatco PWK30-4.
Unicel C-6430 Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.
| OEM | 31489 |
|---|---|
| Unicel | C-6430 |
| Pleatco | PWK30-4 |
| Filbur | FC-3915 |
| Size | 6" (152 mm) × 10-1/2" (267 mm), 30 sq ft |
Sources
- Unicel 2026 Replacement Guide: OEM cross reference (Hot Springs Spas section), PDF p.39 (printed p.35); spec table PDF p.12 (printed p.8) (PDF)
- Pleatco 2023 Catalog: Unicel-to-Pleatco cross reference, PDF p.47 (PDF)
- Filbur Catalog & Reference Guide: Product by Pool/Spa Manufacturer (OEM), Hot Springs, printed p.38 (PDF p.20) (PDF)
- Leisure Time Inc. (Hot Spring/Caldera dealer): Compatibility section: model and model-year list (web page)
- Leisure Time Inc. (Hot Spring/Caldera dealer): Compatibility section: model and model-year list (web page)
Full details → · All Solana spa filters · Which fitting you need · How to install it
Caldera C-6430 cartridge (OEM 31489), 6" (152 mm) × 10-1/2" (267 mm), 30 sq ft. Unicel C-6430, Pleatco PWK30-4.
Unicel C-6430 Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.
| OEM | 31489 |
|---|---|
| Unicel | C-6430 |
| Pleatco | PWK30-4 |
| Filbur | FC-3915 |
| Size | 6" (152 mm) × 10-1/2" (267 mm), 30 sq ft |
Sources
- Unicel 2026 Replacement Guide: OEM cross reference (Caldera section), PDF p.39 (printed p.35); spec table PDF p.12 (printed p.8) (PDF)
- Pleatco 2023 Catalog: Unicel-to-Pleatco cross reference, PDF p.47 (PDF)
- Filbur Catalog & Reference Guide: Product by Pool/Spa Manufacturer (OEM), Hot Springs, printed p.38 (PDF p.20) (PDF)
- Leisure Time Inc. (Hot Spring/Caldera dealer): Compatibility section: model and model-year list (web page)
- Leisure Time Inc. (Hot Spring/Caldera dealer): Compatibility section: model and model-year list (web page)
Full details → · All Caldera spa filters · Which fitting you need · How to install it