PCC105 / C-7471 / FC-1977
105 sq ft replacement filter cartridge • 7″ OD × 26.0625″ long
Pentair's Clean & Clear Plus 420 is a four-cartridge filter, and this is the cartridge, 105 square feet each, 420 square feet across the set. The 'Plus' is what to watch for. Where the plain Clean & Clear uses one fat 10-inch cartridge, the Plus packs four slimmer 7-inch elements. Replace all four at the same time so they clog evenly. Pentair numbers include R173576, R178584, and 570-0425-07, and the cross-references are Unicel C-7471 and Filbur FC-1977. When you shop, make sure you're pricing a set of four, not a single cartridge, and confirm your tank is the 420 model, since the larger 520 uses a taller element.
Compare on Amazon
PCC105 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 | PCC105 | Primary |
| Unicel | C-7471 | Equivalent |
| Filbur | FC-1977 | Equivalent |
| OEM | Pentair R173576 | Original Equipment |
| OEM | Pentair R178584 | Original Equipment |
| OEM | Pentair 178584 | Original Equipment |
| OEM | Pentair 570-0425-07 | Original Equipment |
Always verify dimensions and end-cap type before purchasing a replacement.
Compatible Pool Filter Systems
| Brand | Model |
|---|---|
| Pentair | Clean & Clear Plus 420 |
Frequently Asked Questions
What are the dimensions of the PCC105?
The PCC105 is 7 inches in outer diameter, 26.0625 inches long, with an open top and an open bottom. Total filtration area is 105 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 PCC105?
PCC105 is the same physical cartridge as C-7471, FC-1977, plus OEM versions like Pentair R173576, Pentair R178584, Pentair 178584, Pentair 570-0425-07. Same dimensions (7" × 26.0625"), 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 R173576 the same filter as the PCC105?
Yes. Pentair R173576 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 R173576 (along with Pentair R178584, Pentair 178584, Pentair 570-0425-07) and PCC105, C-7471, FC-1977 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 PCC105?
The PCC105 holds 105 sq ft of media, so it has a healthy buffer before it clogs for good. Plan on 18 to 24 months in a normal residential pool. The pressure gauge is the honest signal here: an 8 to 10 psi rise over the clean pressure that a soak can't reverse means it's time. Channeling, tears, or fibers that won't rinse clean are the other reasons to swap it early.
How do I clean the PCC105?
The PCC105 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 PCC105?
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 | 7″ |
|---|---|
| Length | 26.0625″ |
| Top Type | Open (no end cap) |
| Bottom Type | Open (no end cap) |
| Filtration Area | 105 sq ft |
| Primary Brand | Pleatco |
| Part Number | PCC105 |
Fitment notes
3-inch top and bottom openings. Pentair Clean & Clear Plus 420 (4 cartridges, 420 sq ft total).