PAS35-2 / 7CH-322 / FC-0420 / Coleman/Maax 100520 / Coleman/Maax 3301-2109
35 sq ft replacement filter cartridge • 7.125″ OD × 7.5625″ long
Compare on Amazon
PAS35-2 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 | PAS35-2 | Primary |
| Unicel | 7CH-322 | Equivalent |
| Filbur | FC-0420 | Equivalent |
| OEM | Coleman/Maax 100520 | Original Equipment |
| OEM | Coleman/Maax 3301-2109 | Original Equipment |
Always verify dimensions and end-cap type before purchasing a replacement.
Frequently Asked Questions
What are the dimensions of the PAS35-2?
The PAS35-2 is 7.125 inches in outer diameter, 7.5625 inches long, with a handle top and a threaded bottom. Total filtration area is 35 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 PAS35-2?
PAS35-2 is the same physical cartridge as 7CH-322, FC-0420, plus OEM versions like Coleman/Maax 100520, Coleman/Maax 3301-2109. Same dimensions (7.125" × 7.5625"), same handle top, same threaded 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 Coleman/Maax 100520 the same filter as the PAS35-2?
Yes. Coleman/Maax 100520 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 Coleman/Maax 100520 (along with Coleman/Maax 3301-2109) and PAS35-2, 7CH-322, FC-0420 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 PAS35-2?
Most filter cartridges last between 12 and 24 months. Pull the PAS35-2 every few months for a hose rinse, soak it in cleaner quarterly, and replace it when the pleats are torn, channeling, or won't come clean. Bather load, water chemistry, and how often you actually clean it all matter more than the calendar.
How do I clean the PAS35-2?
The PAS35-2 has a built-in handle on top, which means you can pull it without touching the media. 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 (or at every water change, whichever comes first), do a deep clean: overnight soak in a hot tub filter cleaner, then a thorough rinse. If your cartridge has a closed end cap, let it dry before reinstalling so you don't trap moisture inside the cartridge core.
Which hot tubs and spas use the PAS35-2?
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 | 7.125″ |
|---|---|
| Length | 7.5625″ |
| Top Type | Handle |
| Bottom Type | Threaded fitting |
| Filtration Area | 35 sq ft |
| Primary Brand | Pleatco |
| Part Number | PAS35-2 |
Fitment notes
Handle top with a 2 inch male NPT adapter on the bottom (Pleatco's F2M fitting). This is the 2 inch plumbing version of the Artesian and Coleman top-load cartridge, confirmed through Coleman OEM 100520, which Unicel resolves to the same 7CH-322. Coleman used the 3301-xxxx number format through 2001 and the 100xxx format from 2002, so 3301-2109 and 100520 are the same part in different eras. Two things to check. Unicel rates its 7CH-322 at 32 sq ft against Pleatco's 35 for the identical cartridge, and Unicel notes that the original Artesian part was 7-7/8 inches in diameter and 7-5/8 inches long, so a cartridge pulled from an older tub can measure wider than this one. Pleatco sells the same part under its Coleman number PCS32-2, and lists a PAS35-2 W/O 2"A that ships without the adapter.