PAP150 / C-9415 / FC-0687
150 sq ft replacement filter cartridge • 10.0625″ OD × 31.125″ long
The PAP150 is the larger single cartridge in Pentair's Clean & Clear and Predator line. It's 150 square feet, 10 inches across with a 5-7/8-inch center hole, and over 31 inches tall. Like the 100-square-foot version, it's a one-cartridge tank, so replacement is a single element. Pentair's number is R173216, and the equivalents are Unicel C-9415 and Filbur FC-0687. The only thing to get right is which size your tank takes. The 100 and 150 share the same 10-inch diameter, so the difference is height. Measure your old cartridge, or read the model on the tank, before you choose between them.
Compare on Amazon
PAP150 replacements on Amazon
The buttons below pull up Amazon results for each cross-reference part number. Same physical cartridge, different stickers, often different prices. Cross-shop and pick the cheapest option that has solid recent reviews.
Cross-Reference & Interchangeable Part Numbers
| Brand | Part Number | Type |
|---|---|---|
| Pleatco | PAP150 | Primary |
| Unicel | C-9415 | Equivalent |
| Filbur | FC-0687 | Equivalent |
| OEM | Pentair R173216 | Original Equipment |
Always verify dimensions and end-cap type before purchasing a replacement.
Compatible Pool Filter Systems
| Brand | Model |
|---|---|
| Pentair | Clean & Clear 150 |
| Pentair | Predator 150 |
Frequently Asked Questions
What are the dimensions of the PAP150?
The PAP150 is 10.0625 inches in outer diameter, 31.125 inches long, with an open top and an open bottom. Total filtration area is 150 square feet. Before ordering, pull your existing cartridge and measure it yourself, or check the label inside the housing. OD and length both have to match within about an eighth of an inch, and the end-cap style needs to match exactly so the cartridge seats properly when the lid closes.
What other part numbers are interchangeable with the PAP150?
PAP150 is the same physical cartridge as C-9415, FC-0687, plus OEM versions like Pentair R173216. Same dimensions (10.0625" × 31.125"), same open top, same open bottom. The Pleatco, Unicel, and Filbur boxes ship the same media inside, just with different stickers. The only thing to watch is the end-cap style: if a cross-reference has a slightly different cap design, it may not seat right in your housing.
Is the Pentair R173216 the same filter as the PAP150?
Yes. Pentair R173216 is an OEM number, the code the tub or pool builder stamps on the cartridge they ship. The filter itself is made by Pleatco, Unicel, or Filbur, so Pentair R173216 and PAP150, C-9415, FC-0687 all point to one interchangeable cartridge. Buy whichever is cheapest with solid recent reviews, and just check that the dimensions match your old cartridge before you order.
How often should I replace the PAP150?
At 150 sq ft the PAP150 is a large-format pool cartridge with a lot of media to load up before it fails. In a residential pool with balanced water, two years is a realistic lifespan, sometimes more. Go by pressure rather than the calendar: once filter pressure climbs 8 to 10 psi over the clean starting point and an overnight soak won't bring it back, the media is spent. Torn or channeled pleats mean replacement no matter how old the cartridge is.
How do I clean the PAP150?
The PAP150 has open ends on both top and bottom, so water flows straight through. Pull the cartridge from the housing and hose it down. Hit the pleats from above at about a 45-degree angle so water rinses debris out instead of packing it deeper, and work top to bottom while rotating the cartridge. Skip the pressure washer. The high pressure tears or collapses pleats, and once that happens you've lost media that doesn't come back. Every few months, give it a deeper clean: soak in a dedicated pool filter cleaner per the product's dwell time, then rinse it down completely before reinstalling. Keeping a spare cartridge on the shelf is genuinely worth it. You swap, run the soak overnight, and the pool keeps filtering.
Which hot tubs and spas use the PAP150?
Pull your existing cartridge and read the part number off the end cap, or check the label inside the filter compartment. That's the most reliable way to confirm compatibility.
Dimensions
Specifications
| Outer Diameter | 10.0625″ |
|---|---|
| Length | 31.125″ |
| Top Type | Open (no end cap) |
| Bottom Type | Open (no end cap) |
| Filtration Area | 150 sq ft |
| Primary Brand | Pleatco |
| Part Number | PAP150 |
Fitment notes
5-7/8 inch center hole. Pentair Clean & Clear 150 and Predator 150.