Marquis 20045 Filter Cartridge
Marquis OEM number • 35 sq ft • 5.1875″ OD × 11.9375″ long
20045 is Marquis's number for this cartridge, not a part you have to buy from Marquis. The filter itself is a 35 square foot cartridge measuring 5.1875 inches across and 11.9375 inches long, and Pleatco, Unicel, and Filbur all build it. If you read 20045 off an old cartridge or found it in your manual, any of the numbers below drops into the same housing.
Marquis also lists 370-0215 against this cartridge. Different numbers on paper, same filter in the box.
Fitment notes
Closed top, 1-5/8 inch bottom hole. Marquis Pacific series 1995-1999: Euphoria, Reward, Retreat, Departure, Voyager RS. Unicel rates the equivalent C-5423 at 34 sq ft against Pleatco's 35. Pleatco's 2008 catalog lists this cartridge as PPM35 without the TC suffix.
What to buy instead
Replacements for the Marquis 20045
Each button searches Amazon for one of the numbers this cartridge is sold under. The OEM version is usually the most expensive of the set and the aftermarket versions are the same physical filter, so it is worth checking all of them before you order.
Every number for this filter
| Brand | Part Number | Type |
|---|---|---|
| Marquis | 20045 | The number you searched |
| Pleatco | PPM35TC | Aftermarket equivalent |
| Unicel | C-5423 | Aftermarket equivalent |
| Filbur | FC-3623 | Aftermarket equivalent |
| Marquis | 370-0215 | Other OEM number |
Full specs, the cartridge diagram, and the complete compatibility list live on the PPM35TC cartridge page. You can also see every 5.1875″ × 11.9375″ cartridge if you are checking a measurement rather than a part number.
Equipment that uses this cartridge
Looking for a different model? Browse every Marquis model we cover.
Frequently Asked Questions
What filter replaces the Marquis 20045?
The PPM35TC replaces it directly, and so does every cross-reference for it: C-5423, FC-3623. All of them are the same 35 sq ft cartridge at 5.1875" outer diameter and 11.9375" long. Buy whichever is cheapest at the time with solid recent reviews. The same cartridge also shows up as Marquis 370-0215, so those are not different filters either.
Is the Marquis 20045 the same as the PPM35TC?
Yes, physically the same filter. Marquis 20045 is an OEM number, meaning it is the code Marquis put on the cartridge that shipped with the equipment. Marquis does not manufacture cartridges. Pleatco, Unicel, and Filbur do, and they sell the identical part under their own numbers at a lower price. Match the dimensions against your old cartridge before ordering and you are covered.
Do I have to buy the Marquis version?
No. Nothing about the housing requires an OEM-branded cartridge, and the warranty on your equipment is not voided by using an aftermarket filter that meets the same spec. The reason to buy OEM is convenience, not performance. The reason not to is price, which is often a meaningful gap for an identical part. What matters is that outer diameter, length, and end-cap style all match.
What size is the Marquis 20045?
5.1875 inches in outer diameter, 11.9375 inches long, with 35 square feet of filter media. Both measurements need to land within about an eighth of an inch, and the end caps have to match so the cartridge seats correctly when you close the lid. Measure your old one rather than trusting a number that has worn off the label.
Last verified August 2026