PC7-120 / C-4607 / FC-3710
5 sq ft replacement filter cartridge • 4.25″ OD × 8″ long
This is the pleated replacement for the Intex 'Type A' filter, the most common cartridge in Intex Easy Set and Krystal Klear above-ground pools with the smaller pumps. At just 5 square feet it's tiny. Intex's own version is a thin paper element that clogs quickly, so a pleated Pleatco (PC7-120), Unicel (C-4607), or Filbur (FC-3710) gives you more surface area in the same 4-1/4-inch-wide, 8-inch-tall footprint. Intex sizing is proprietary and doesn't cross-reference to the standard pool-filter ecosystem, so 'Type A' is really what you're matching. If your pump's cartridge is labeled Type A or 59901, this fits.
Compare on Amazon
PC7-120 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 | PC7-120 | Primary |
| Unicel | C-4607 | Equivalent |
| Filbur | FC-3710 | Equivalent |
| OEM | Intex 59901 | Original Equipment |
| OEM | Intex Type A | Original Equipment |
Always verify dimensions and end-cap type before purchasing a replacement.
Compatible Pool Filter Systems
| Brand | Model |
|---|---|
| Intex | Easy Set Type A |
| Intex | Krystal Klear Type A |
Frequently Asked Questions
What are the dimensions of the PC7-120?
The PC7-120 is 4.25 inches in outer diameter, 8 inches long, with an open top and an open bottom. Total filtration area is 5 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 PC7-120?
PC7-120 is the same physical cartridge as C-4607, FC-3710, plus OEM versions like Intex 59901, Intex Type A. Same dimensions (4.25" × 8"), 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 Intex 59901 the same filter as the PC7-120?
Yes. Intex 59901 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 Intex 59901 (along with Intex Type A) and PC7-120, C-4607, FC-3710 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 PC7-120?
At 5 sq ft the PC7-120 runs smaller than the big 100-plus sq ft pool cartridges, so it has less buffer between cleanings. Expect 12 to 18 months in normal use, less if the pool sees heavy traffic or the chemistry drifts. Watch the gauge: when pressure sits 8 to 10 psi above the clean starting point and a soak won't drop it, put in a fresh one.
How do I clean the PC7-120?
The PC7-120 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 PC7-120?
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 | 4.25″ |
|---|---|
| Length | 8″ |
| Top Type | Open (no end cap) |
| Bottom Type | Open (no end cap) |
| Filtration Area | 5 sq ft |
| Primary Brand | Pleatco |
| Part Number | PC7-120 |
Fitment notes
1-15/16 inch inner diameter. Intex Easy Set Type A, used on smaller above-ground pool pumps.