Why it matters
The Pentair 178561 Spa Filter Cartridge is a replacement spa and hot tub filter cartridge.
Match the part number on your old cartridge or filter housing first; if it has worn off, measure length, outside diameter and both center holes. A cartridge that is close but not exact can let dirty water bypass its seals.
The listing gives a weight of 5 pounds, plastic construction and pentair 178561 almond lid assembly replacement in the box.
Who it's for, and who should skip it
Good fit if
- Spas and hot tubs
- Owners with the original part number
Look elsewhere if
- Filters with a different part number
Pros and cons
Pros
- Cross-referenced replacement
Cons
- Check length and hole sizes against your old cartridge
- Replace every one to three seasons
Limitations to weigh
- Specifications are the maker's or seller's own; check fit against your equipment's manual and part numbers.
Specifications
Every figure below comes from the source shown in brackets. Where the maker doesn't state something, we say so instead of estimating.
| Material | Plastic | Retailer |
|---|---|---|
| Product weight | 5 lb | Retailer |
| Model number | 178561 | Retailer |
Alternatives worth comparing
More pool and spa filter cartridges we cover
- Future Way Filter Cartridge
- Volca Spares Filter Cartridge
- Pool Health Group PHAC6 Filter Cartridge
- U.S. Pool Supply FCA-4 Filter Cartridge
All pool and spa filter cartridges, compared in one table · Every Pentair product we cover
Final verdict
A practical spa cartridge for spas and hot tubs.
Where to buy
Our links open this exact model's product page. Prices and stock change; check what's included before you order.
Each button opens this exact model. We may earn a commission on tracked links; it never changes what we publish. Disclosure