Which filter does my Marquis hot tub take? Lookup by series and year
Per Marquis’s own filter finder: Crown Series from 2021 and the big Elite models (Woodstock, Vegas, Hollywood, Broadway, Monaco Elite) from 2020 take the threaded 50 sq ft 20690 (Unicel 5CH-512, 5-3/16" × 16"). Signature Series 2000–2021 take threaded 20091 (50 sq ft) or 20092 (35 sq ft); Vector21 takes 20092. Celebrity from 2019 and the Nashville Elite take threaded 20042 (35 sq ft). Older slip-on filters: 20044 (Signature 1997–1999), 20045 (before 1997), 20364 (e-Series 2010–2018) and 20342 (e-Series 2008–2010, Celebrity 2012–2018). Many larger Signature, Crown and e-Series models hold two filters, so you may need a pair.
Affiliate disclosure: this page has no retailer links. Some cartridge pages it links to do, and we may earn a commission from qualifying purchases made through them at no cost to you. Read our affiliate disclosure.
The cartridges, with equivalents
| Factory part | What it is | Aftermarket equivalents (catalogs) | Rated area | Our page |
|---|---|---|---|---|
| 20690 (370-0699) | Threaded filter with bar handle: Crown 2021+, Elite 2020+, Celebrity Series Elite models 2018–2019 Two Marquis parts dealers give the same 5-3/16" × 16", handle, 2" MPT, 50 sq ft size; they describe it as used on Celebrity Elite and V150 models. | Unicel 5CH-512 (5-3/16" × 16", 2" MPT). No Pleatco or Filbur entry | 50 sq ft | 5CH-512 |
| 20091 (20041, 370-0237) | Threaded filter, Signature Series 2000–2021 | Unicel 5CH-502 (5-3/16" × 12-1/2", 2" MPT); Pleatco PPM50SC-F2M; Filbur FC-0195 | 50 sq ft | 5CH-502 |
| 20092 / 20042 (370-0240, 370-0242, 370-0243, 370-0683, 370-0698) | Threaded filter: 20092 for Signature 2000–2021 and Vector21 2016+; 20042 for Celebrity 2019+ and Nashville Elite Unicel cross-references both 20042 and 20092 to the same 5CH-352. | Unicel 5CH-352 (5-3/16" × 12-1/2", 2" MPT); Pleatco PPM35SC-F2M; Filbur FC-0196 | 35 sq ft | 5CH-352 |
| 20044 (370-0236) | Slip-on filter, closed top, Signature Series 1997–1999 Filbur prints the second Marquis number as 370-217, not Unicel’s 370-0236. | Unicel C-5346 (5-3/16" × 14-1/8", 1-5/8" open bottom); Pleatco PPM50TC; Filbur FC-3638 | 50 sq ft | C-5346 |
| 20045 (370-0215) | Slip-on filter, closed top, Signature Series before 1997 | Unicel C-5423 (5-3/16" × 11-15/16", 1-5/8" open bottom); Pleatco PPM35TC; Filbur FC-3623 | 35 sq ft (Marquis); Unicel rates its replacement 34 and says the original was 25 | C-5423 |
| 20364 | Slip-on filter, e-Series 2010–2018 (dealer: 5" × 13-1/4", 2-1/8" hole top and bottom, Microban) | None listed | 35 sq ft (Marquis and dealer) | not listed |
| 20342 | Slip-on filter, e-Series 2008–2010 and Celebrity 2012–2018 (dealer: 5" × 6-5/8", 2-1/8" holes) | None listed. Same outside size as Pleatco PRB25SF and Unicel C-4405, but neither catalog lists it for Marquis | 25 sq ft (Marquis and dealer) | not listed |
| 20043 (370-0216) | Closed-top slip-on filter that Unicel lists as “Pacific Marquis (new)”. Not in Marquis’s current finder | Unicel C-5434 (5-3/16" × 19-5/8"); Pleatco PPM60TC; Filbur FC-3634 | 60 sq ft (Unicel says the original was 40) | C-5434 |
| 20499 (370-0694) | Long threaded antimicrobial filter. Listed only by Unicel; not in Marquis’s current finder and no source we found names the models | Unicel 5CH-902AM (5-3/16" × 30", 2" MPT) | 90 sq ft (Unicel) | 5CH-902AM |
Equivalents and sizes are from the Unicel 2026 Replacement Guide, the Pleatco 2023 catalog and the Filbur catalog, matched on the Marquis number. Unicel and Pleatco also list older Marquis numbers in the 370-xxxx series; they are shown in brackets. “None listed” means none of the three catalogs lists that Marquis number.
Find your series and year
Marquis sorts its filters by series and build year, and its own filter finder is the source for every row below. The last column adds what Marquis’s owner’s manuals say about how many filters each model holds: when a model has two canisters, buy two cartridges. A Signature spa from 2000–2021 can take either the 50 or the 35 sq ft threaded filter; the finder does not say which models take which, so read the part number or measure the length (12-1/2" for both, so check the label).
| Series | Model years | Filter (Marquis part) | Filters per spa (owner’s manuals) |
|---|---|---|---|
| Crown Series | 2021 and newer | 20690, threaded, 50 sq ft | 2021–2023 Crown manuals: two filter canisters on Summit, Epic, Euphoria, Resort and Destiny; one on Wish (1- and 2-pump) and Spirit |
| Signature Series | 2000–2021 | 20091 (threaded, 50 sq ft) or 20092 (threaded, 35 sq ft) | 2021 Signature manual: two canisters on Show, Epic, Euphoria, Wish, Reward and Resort; one on Promise (1- and 2-pump) and Spirit |
| Signature Series | 1997–1999 | 20044, slip-on, 50 sq ft | not listed |
| Signature Series | Before 1997 | 20045, slip-on, 35 sq ft | not listed |
| Vector21 (V65L, V77L, V84, V84L, V94, V94L) | 2016 and newer | 20092, threaded, 35 sq ft | 2021 V21 manual: one filter on the V77L; two on the V84, V84L and V94L (the V65L and V94 counts are in images we could not read) |
| e-Series | 2010–2018 | 20364, slip-on, 35 sq ft | 2017 e-Series manual: two canisters on the 750, 660 and 545; one on the 524, 435, 425 and 322 |
| e-Series | 2008–2010 | 20342, slip-on, 25 sq ft | not listed |
| Elite: Woodstock, Vegas, Hollywood, Broadway, Monaco Elite | 2020 and newer | 20690, threaded, 50 sq ft | Elite manuals 2020–2026: one filter |
| Elite: Nashville Elite | 2020 and newer | 20042, threaded, 35 sq ft | One filter (see the conflict below on its rating) |
| Celebrity Series Elite models (Woodstock, Vegas, Hollywood, Broadway, Monaco Elite) | 2018–2019 | 20690, threaded, 50 sq ft | 2018 Celebrity manual: one filter, 50 sq ft in Celebrity Elite |
| Celebrity Series: Nashville Elite | 2018–2019 | 20042, threaded, 35 sq ft | One filter |
| Celebrity hot tubs | 2019 and newer | 20042, threaded, 35 sq ft | Celebrity manuals 2020–2026: one filter, 35 sq ft |
| Celebrity hot tubs | 2012–2018 | 20342, slip-on, 25 sq ft | One filter |
Threaded or slip-on: how to tell
Marquis’s finder splits filters into two families. A threaded filter has a handle on top and screws into the canister; Marquis’s 2026 Celebrity manual says to turn the raised bar counter-clockwise to remove it. A slip-on filter has no thread and pushes onto a standpipe. Every Marquis filter from 2019 on in the finder is threaded; the slip-on parts (20044, 20045, 20364, 20342) are for older spas.
Where the sources disagree
- Crown filter size. The finder lists the 50 sq ft 20690 for Crown 2021 and newer, and the 2021–2023 Crown manuals show two filter canisters on most models. Marquis’s 2026 Crown owner’s manual instead says the spa “features one filter, 35 sq ft cartridge”. If you have a 2026 Crown, check the label on the installed cartridge before ordering.
- Which models take 20690. The finder ties it to Crown, Elite and the 2018–2019 Celebrity Elite models. Two dealers describe it only as the filter for Celebrity Elite and V150 models.
- Nashville Elite rating. The finder gives the Nashville Elite the 35 sq ft 20042, while the 2020–2026 Elite manuals say the Elite filter is 50 sq ft without singling out the Nashville.
- Celebrity 2018. The finder lists the 25 sq ft slip-on 20342 for Celebrity hot tubs 2012–2018 and the 35 sq ft 20042 from 2019. The 2018 Celebrity manual already says “one filter, 35 sq ft in Celebrity”. One dealer listing for 20342 says Celebrity 2012–2018 in one place and 2010–2018 in another.
- Signature 2000 and later. Marquis’s 2001 and 2002 owner’s manuals say all 2000-and-later spas use #5040, a 50 sq ft T-handle cartridge; the current finder splits the same years between 20091 (50) and 20092 (35).
- 20045 rating. Marquis calls 20045 a 35 sq ft filter. Unicel says the original was 25 sq ft (115 pleats) and rates its C-5423 replacement at 34.
- Second number for 20044. Unicel lists 370-0236; Filbur prints 370-217 for the same 5-3/16" × 14-1/8" closed-top size.
Known limits
- None of the three catalogs lists 20364 or 20342, so no aftermarket equivalent is given for them. Their sizes come from dealer listings only.
- Marquis’s finder does not cover 20043 or 20499, and no source we found gives the models or years for either.
- The finder gives no dimensions; sizes in the parts table come from the catalogs and dealers.
- Filter counts per model come from the spec tables in the 2017, 2021 and 2022 manuals. The 2026 manuals show these tables as images we could not read.
How to confirm yours
- Read the number on the old cartridge’s label or end cap and search it here.
- No number? Measure the length and check for a thread. Threaded 5-3/16" cartridges are 12-1/2" (20091, 20092 or 20042) or 16" (20690); our filter-size guide shows how to measure.
- Marquis’s owner’s manuals recommend cleaning the filter monthly; see how often to clean a hot tub filter.
Why one cartridge size can carry two different square-foot ratings: our explainer with Unicel’s pleat-count table.
Sources
- Marquis Spas: Hot tub filters: Filter Finder (series, model years, slip-on or threaded, sq ft, part numbers; fetched 2026-10-30)
- Marquis Spas: 2026 Crown owner’s manual (“one filter, 35 sq ft cartridge”)
- Marquis Spas: 2022 Crown owner’s manual (filter canisters per model)
- Marquis Spas: 2021 Crown owner’s manual (filter canisters per model)
- Marquis Spas: 2021 Signature owner’s manual (filter canisters per model)
- Marquis Spas: 2021 Vector21 owner’s manual (Vortex filters per model)
- Marquis Spas: 2017 e-Series owner’s manual (filter canisters per model)
- Marquis Spas: 2026 Elite owner’s manual (one filter, 50 sq ft)
- Marquis Spas: 2026 Celebrity owner’s manual (one filter, 35 sq ft; removal)
- Marquis Spas: 2018 Celebrity owner’s manual (35 sq ft Celebrity, 50 sq ft Celebrity Elite)
- Marquis Spas: 2001 owner’s manual (#5040 50 sq ft cartridge for 2000 and later)
- Canada Hot Tub Parts: Marquis filter 20690 (size, fitting, models)
- Hot Spring Supply: Marquis Crown Collection 2021 threaded 50 sq ft filter 20690
- Canada Hot Tub Parts: Marquis filter 20364 (size, e-Series 2010+)
- Pool and Hot Tub Depot: Marquis filter 20342 (size, e-Series and Celebrity years)
- Unicel 2026 Replacement Guide: Marquis Spas cross-reference (printed p. 40) and spec tables
- Pleatco 2023 Catalog: PPM35SC-F2M, PPM50SC-F2M, PPM50TC, PPM35TC, PPM60TC, PRB25SF
- Filbur Catalog & Reference Guide: Marquis Spas section (FC-0195, FC-0196, FC-3623, FC-3634, FC-3638)
This page summarizes published catalogs and dealer fitment tables; always follow your own spa’s owner’s manual. See our disclaimer and methodology.