Which filter does my Master Spas hot tub or swim spa take? Lookup by series and year
Most Master Spas from 2004 to 2024 use a pleated outer cartridge around an X268532 EcoPur Charge core, and the outer depends on the series: X268546 for Twilight and Legend (3-filter models add a standalone X268543), X268548 for Healthy Living, Clarity, Balance and Precision and the TS 120/240, X268550 for Getaway, and X268549 plus a standalone X268542 for H2X and Michael Phelps swim spas. 2025 and newer models moved to new cartridges (X268566, X268567, X268560, X268568, X268569) that do not swap with the older ones. 1996–2001 Legend and Down East spas use the single 70 sq ft X268500.
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The cartridges, with equivalents
| Factory part | What it is | Aftermarket equivalents (catalogs) | Rated area | Our page |
|---|---|---|---|---|
| X268546 (PMA-R1) | Pleated outer around the EcoPur core; Twilight, Legend, Down East, Therapool SE/D, Legacy 2023. Replaces X268551, X268512 and X268533 The dealer lists the factory part as 6.5" × 7.75", not Unicel’s 6" × 8". | Unicel 6CH-352 (6" × 8", 2" MPT; Unicel: remove the black standpipe) | 35 sq ft (Unicel 6CH-352) | 6CH-352 |
| X268543 (was X268365) | Second, standalone cartridge on 3-filter Twilight and Legend models 2014–2024 Dealer size for X268543: 6.5" × 9.25". | Pleatco PMA40L-F2M (6" × 9-1/4", lists X268365); Unicel 6CH-402 (6" × 9-1/2"); Filbur FC-0317 | 40 sq ft | 6CH-402 |
| X268532 | EcoPur Charge mineral core (1-7/8" × 7", 8" with handle). Replaces X268511, X268056, X268513, X268045 The dealer says to replace it every 6 months, never soak it in cleaner, and not to use it with bromine. | None listed. The dealer says there is no aftermarket version | Not a pleated filter | not listed |
| X268548 (PMA-R3) | Pleated outer, 8.5" long; TS 120/240, Healthy Living, Clarity/Balance/Precision to 2024, Therapool 13/15. Replaces X268514, X268545, X268544, X268520 | None listed by this number | Not given in our sources | not listed |
| X268549 (PMA-R4) | Pleated outer, 6" × 7.25"; H2X and Michael Phelps swim spas | None listed by this number | Not given in our sources | not listed |
| X268550 (PMA-R5) | Pleated outer, 5" × 8"; Getaway 2017–2024 | None listed by this number | Not given in our sources | not listed |
| X268542 (PWW50P3) | Standalone swim-spa cartridge, 6" × 7.63" (dealer). Replaces X265010 | Pleatco PWW50P3 (Waterway front access, 1-1/2" SAE); Unicel 6CH-940 (6" × 8-1/4"); Filbur FC-0359 | 45 sq ft (Unicel, Master Spas swim spas) | 6CH-940 |
| X268554 (PWW35L) | 5" × 8.5" cartridge; Therapool 13/15, Contractor 2012, Instinct 2025 | Pleatco PWW35L (5" × 8-1/2"); Unicel 4CH-935 | 35 sq ft (Pleatco) | not listed |
| X268500 (PMA70-F2M) | Single cartridge, 1996–2001 Legend and Down East | Pleatco PMA70-F2M (8" × 9-1/4"); the dealer lists Filbur FC-0516 | 70 sq ft | not listed |
| X268057 (PMA10) | Old-style Eco-Pur insert, 3-7/8" × 7-1/8" Pleatco says “2004 and later”; the dealer guide puts it in 2001–2003 spas. | Pleatco PMA10; Unicel C-3310AM (3-7/8" × 7") | 10 sq ft (Pleatco) / 8 sq ft (Unicel) | not listed |
| X268080 (PMA40-F2M) | Older Legacy and Freedom | Pleatco PMA40-F2M (7-1/8" × 7-3/16"); Filbur FC-0416 | 40 sq ft (Pleatco) | not listed |
| X268521 (PMA20-F2M) | Contractor Series CS 415 (dealer: 4.75" × 9.75" overall) | Unicel 4CH-252 (4-5/8" × 8"; Unicel notes the original is 4-3/4" OD); Pleatco PMA20-F2M (4-3/4" × 8-1/16") | 25 sq ft (Unicel) / 20 sq ft (Pleatco) | 4CH-252 |
| X268566 / X268567 / X268560 | 2025 platform: X268566 pleated 6" × 9", X268567 short version 6" × 7.5", X268560 standalone 6" × 9" (late units stamped X268572) | None listed (the catalogs predate them) | Not given in our sources | not listed |
| X268568 / X268569 / X268559 | 2025 platform: X268568 5" × 8.5" (TS 240X, Clarity), X268569 5" × 7.5" (Getaway), X268559 5" × 8.5" for systems without EcoPur | None listed | Not given in our sources | not listed |
Equivalents are from the Unicel 2026 Replacement Guide, the Pleatco 2023 catalog and the Filbur catalog. Master Spas dealers sell some factory parts under Pleatco-style names (PMA-R1 for X268546 and so on), shown in brackets. Dealer sizes are from masterspapartsonline.com product listings.
Find your series and year
Rows are from the filter guide kept by Suntek Pools & Spas, a Master Spas dealer (masterspapartsonline.com; its chart says it was last updated 22 July 2026), condensed to one line per series and period. Where a second dealer, masterspaparts.com, says something different, it is in the next section. “+” means the parts are used together in one filter well.
| Series / models | Years | Filters |
|---|---|---|
| Twilight Series except TS 120/240 (TS 6.2, 7.2, 7.25, 8.2, 8.25, 8.3, 87.3 and others) | 2009–2024 (2009–2010 TS x.1 and x.15 models were documented without the EcoPur insert) | X268546 + X268532 EcoPur Charge + X268543 |
| Twilight TS 120 / TS 240 | 2010–2024 | X268548 + X268532 EcoPur Charge (some 2010–2014 units used the 13" X268553 instead) |
| Twilight Series, 3-filter models (2025 “Heritage” models on the old platform keep the 2017–2024 set) | 2025 on | X268566 + X268532 EcoPur Charge + X268560 |
| Twilight Series, 2-filter models | 2025 on | X268567 + X268532 EcoPur Charge |
| Twilight TS 240X | 2025 on | X268568 + X268532 EcoPur Charge |
| Legend (early) | 1996–2000 | X268500 (single 70 sq ft) |
| Legend | 2001–2003 | X268057 old-style Eco-Pur + pleated outer (outer number varies) |
| Legend LSX | 2004–2013 | Usually two wells, each X268546 + X268532 EcoPur Charge |
| Legend LSX | 2014–2024 | X268546 + X268532 EcoPur Charge + X268543 |
| MP Legend | 2025 on | X268566 or X268567 + X268532 EcoPur Charge + X268560 |
| Healthy Living (HL7, HL 7.5, HL8, HL 8.5, HL 628 and others) | 2013–2021 | X268548 + X268532 EcoPur Charge |
| Clarity CLS 524 / 730 / 738 / 855 / 1055 | 2013–2015 | X268548 + X268532 EcoPur Charge |
| Clarity CLS 360 / 415 | 2013–2015 | Not confirmed by the dealer (X268521 is “likely” for the CLS 415) |
| Balance and Precision | 2016–2024 | X268548 + X268532 EcoPur Charge |
| Clarity (Balance, Precision) | 2025 on | X268568 + X268532 EcoPur Charge (see the change-over note below) |
| Getaway San Miguel, Ocho Rios, Bar Harbor | 2017–2024 | X268550 + X268532 EcoPur Charge |
| Getaway | 2025 on | X268569 + X268532 EcoPur Charge |
| Down East | 1996–2001 | X268500 (1996–2000; some 1999–2001 spas used the 5" X268201, 25 sq ft, now discontinued) |
| Down East | 2002–2003 / 2004–2013 | X268057 old-style / X268546 + X268532 EcoPur Charge |
| Down East Somerset, East Hampton | 2010–2012 | X268548 + X268532 EcoPur Charge |
| H2X swim spas (all) | 2006–2016 | X268549 + X268532 EcoPur Charge + X268542 |
| H2X Trainer 12 | 2017–2024 | X268542 only (×1) |
| H2X Trainer 15/15D/18/18D, Challenger 15D/18D | 2017–2024 | Two each of X268549, X268532 and X268542 |
| H2X Trainer 19/19D, Challenger 19D | 2017–2024 | Seven-filter system: 2 × X268549, 2 × X268532, 3 × X268542 |
| H2X Trainer 15/15D/19/19D, Challenger 15D/19D; 19D MAX, 21, 21D | 2025 on | X268566 + X268532 EcoPur Charge + X268560 |
| H2X Trainer 12, 18D, Challenger 18D | 2025 on | Unchanged: X268549 + X268532 + X268542 |
| H2X Therapool SE / D | 2017–2024 / 2025 on | X268546 + X268532 + X268543 / X268566 + X268532 + X268560 |
| H2X Therapool 13 / 15 | 2019 on | X268548 + X268532 EcoPur Charge + X268554 |
| Michael Phelps swim spas | 2011–2016 | X268549 + X268532 + X268542; 2017–2024 Force/Signature use a 4-filter set, Momentum a 7-filter set of the same parts; 2025 models kept them |
| Legacy (Whirlpool, Intrepid, Inspire, Enterprise, 730L, Acclaim) | 2023 | X268546 + X268532 EcoPur Charge |
| Older Legacy and Freedom | Years not given | X268080 (some use X268300 or X268526) |
| Contractor Series | Up to 2011 / 2012 | X268519 (now X268558) / X268554; CS 415: X268521 |
| Instinct | 2025 / 2026 | X268554 / X268563 |
Where the sources disagree
- 2025–2026 Clarity. The Suntek chart lists X268568. Suntek’s own X268566 listing says Clarity spas made on or after 15 April 2026 take X268566 and earlier 2025 models X268568. Masterspaparts.com says Master Spas changed the Clarity filter during 2026 and associates X268569 with “updated Clarity and Getaway” lines. Check the cartridge before ordering.
- 2025 H2X swim spas. Suntek lists X268566 + X268532 + X268560 for most 2025 H2X models (and notes that the factory store lists X268559 for “most 2025 H2X”). Masterspaparts.com gives X268559 for most H2X swim spas.
- X268572. Suntek treats it as a late-production stamping of X268560. Masterspaparts.com presents it as the cartridge for most 2025 Twilight, MP Legend, Living Healthy and many H2X models.
- X268568. Masterspaparts.com says it is exclusively for the TS 240; Suntek also lists it for 2025 Clarity.
- Old-style Eco-Pur years. Pleatco labels PMA10 (X268057) “Eco-pur replacement 2004 and later”; Suntek puts X268057 in 2001–2003 spas and the black-standpipe X268546 set from 2004. Unicel splits its Eco-Pur outer cartridges as C-7330 for 2002–2005 and C-8341 (two required) for 2006 on.
- X268546 size. Unicel’s 6CH-352 is 6" × 8"; Suntek lists the factory part at 6.5" × 7.75". Unicel says to remove the black standpipe when using 6CH-352.
- Healthy Living years. Suntek lists 2013–2016 and 2017–2021, and notes the factory tables show 2018–2020.
Known limits
- None of the three aftermarket catalogs lists X268548, X268549, X268550 or any 2025-platform part by number, and Suntek says there is no aftermarket EcoPur Charge.
- Suntek marks several lines as “confirm with serial”: Clarity CLS 360/415 (2013–2015), Getaway Caribbean (2014–2016), Living Healthy L5–S7 (2025 on) and Michael Phelps Xtreme. We do not list a filter for them. For the LH line, Suntek reports that Master Spas’ official part finder shows a single cartridge, X268543 for 2023–2024 LH6/LH7 and X268560 for 2025–2026 LH6/LH7.
- Sizes for X268546 to X268569 come from one dealer’s listings; Master Spas publishes no public spec sheet that we found.
How to confirm yours
- Read the X2685xx number on the old cartridge and search it here.
- Use the serial number. Per Suntek, on most spas built since 2009 the first two digits are the model year (22… = 2022); Getaway serials start with R, swim spas with H, and spas built before 2009 start with M.
- 2025 cartridges do not fit older housings. Suntek says adapters X251168 and X251169 exist to retrofit 2025 filters into earlier spas.
- Citing Master Spas’ owner’s manuals, Suntek suggests rinsing the pleated cartridges weekly, soaking them monthly, replacing them about every 12 months, and replacing the EcoPur Charge every 6 months. See also 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
- Suntek Pools & Spas (masterspapartsonline.com): Master Spas Filter Guide (series and year tables, supersessions, serial-number tips; chart dated 2026-07-22, fetched 2026-10-27)
- masterspapartsonline.com: product listings for X268546, X268548, X268549, X268550, X268532, X268543, X268542, X268554, X268500, X268566, X268567, X268568, X268560, X268569, X268559 (sizes, Pleatco-style names)
- masterspaparts.com: 2025 Master Spas filters
- Unicel 2026 Replacement Guide: Master Spas cross-reference (6CH-352, 6CH-402, 6CH-940, 4CH-252, C-3310AM, C-7330, C-8341)
- Pleatco 2023 Catalog: PMA10, PMA20-F2M, PMA40-F2M, PMA40L-F2M, PMA70-F2M, PWW35L, PWW50P3
- Filbur Catalog & Reference Guide: Master Spas (FC-0317, FC-0416, FC-0359)
This page summarizes published catalogs and dealer fitment tables; always follow your own spa’s owner’s manual. See our disclaimer and methodology.