Dimension One Spas OEM 1561-10 spa filter (7CH-552)

Dimension One Spas

Replacement numbers

Unicel 7CH-552

Fits Dimension One Spas OEM 1561-10.

Diameter 7" (178 mm)Length 10-1/2" (267 mm)52 sq ft2 models listed

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Unicel7CH-552
Pleatconot found in source
Filburnot found in Filbur catalog
Topsemi-circular handle
Bottom2” male thread/MPT
Ø 7" (178 mm)10-1/2" (267 mm)Side view · end views belowTopBottom
Top: semi-circular handle
Bottom: 2” male thread/MPT
Drawn to scale from the listed diameter and length. Handles, threads and closed ends are drawn as symbols, not to scale. 52 sq ft media.

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Dimension One Spas files this cartridge as 7CH-552 cartridge (OEM 1561-10), in the Dimension One Spas group. Numbers on the row: OEM 1561-10; Unicel 7CH-552. 7" across, 10-1/2" long, top semi-circular handle, bottom 2” male thread/MPT, 52 sq ft.

1561-10 carries this note from the catalogs: Unicel's Dimension One cross reference rates 1561-10 / 7CH-552 at 75 sq ft, but Unicel's own spec table rates 7CH-552 at 52 sq ft (7" x 10-1/2", 2" MPT, semi-circular handle), and both retailer listings (Hot Tub Outpost and SpaStore) give 52 sq ft at 7" x 10-1/2" with a 2" MPT bottom; 52 is shown. Both retailers name Pleatco PTL55XW-F2M and Filbur FC-0465 as equivalents, but the Pleatco 2023 catalog lists PTL55XW-F2M among its deactivated part numbers with no replacement (PDF p.24) and the Filbur catalog does not list FC-0465, so neither is shown as a current equivalent. Hot Tub Outpost lists the 1994 Arena and Diamante under this part, while its 01561-03 listing also names the 1994 Arena and Diamante; check the old cartridge.

Dimension One Spas applications recorded for this cartridge: Dimension One Platinum Series, years 1995, listed by Hot Tub Outpost OEM listing; Dimension One Arena, Diamante, years 1994, listed by Hot Tub Outpost OEM listing (listed as Diamonte).

Before ordering 7CH-552, compare it with 7CH-975 differs by Unicel 7CH-975, Pleatco PDO75P3, Filbur FC-0475, bottom 1-1/2" SAE thread, 75 sq ft, OEM 1561-12; and C-7367 differs by Unicel C-7367, Pleatco PDO75-2000, Filbur FC-3059, 7-1/8" diameter, top closed w/ Y stand-offs, bottom 2" / open w/ twist lock, 75 sq ft, OEM 1561-00, note says Unicel and Filbur both flag this for Dimension One 75 models dated after 2000. Pleatco prints the size as 7-1/4" x 10-5/8" (castle top, open with twist lock) against Unicel's 7-1/8" x 10-1/2"..

Pleatco and Filbur do not have a number on this row. Search 1561-10 or the Dimension One Spas part you pulled out of the spa.

Left blank on purpose: no current Pleatco or Filbur equivalent (Pleatco PTL55XW-F2M deactivated; FC-0465 not in the Filbur catalog); 1994 Arena/Diamante also listed under 1561-03.

Pages checked for 1561-10: Unicel 2026 Replacement Guide on 7CH-552 (OEM cross reference (Dimension One Spas section), PDF p.33 (printed p.29), 75 sq ft; spec table PDF p.15 (printed p.11), 7CH-552 rated 52 sq ft). Hot Tub Outpost (retailer OEM listing) on 7CH-552 (01561-10: 7" x 10.5", handle, 2" MPT fine thread, 52 sq ft; 1995 Platinum Series, 1994 Arena and Diamonte; replaces Unicel 7CH-552, Filbur FC-0465, Pleatco PTL55XW-F2M). SpaStore.com (retailer) on 7CH-552 (AK-9026: OEM 1561-10, Unicel 7CH-552, Pleatco PTL55XW-F2M, Filbur FC-0465; 7" x 10-1/2", handle, 2" MPT, 52 sq ft). Pleatco 2023 Catalog on 7CH-552 (Deactivated Pleatco part numbers, PDF p.24: PTL55XW-F2M, replacement N/A).

Hot tubs listed for this cartridge

The rest of the Dimension One Spas model list is the Dimension One Spas filter by model and year lookup.

Model / systemYearsListed by
Dimension One Platinum Series1995Hot Tub Outpost OEM listing
Dimension One Arena, Diamante (listed as Diamonte)1994Hot Tub Outpost OEM listing

Check the cartridge you removed

Measure diameter, length, and both ends, then compare them with the figures above. The steps are in the measuring guide. Why the bottom decides whether it seals: open-end vs threaded filters. Power, the retainer, and not running the spa empty: how to install a cartridge. Number formats: how Filbur, Unicel and Pleatco numbers compare.

Other Dimension One Spas cartridges

All 12 Dimension One Spas spa filters

Every number on this row, on one screen: cross-reference lookup. Published clean and replace intervals for this cartridge, and a buy link for the numbers above: replacement schedule and reorder. The interval comparison by brand: calculator.

Cleaner and test strips

Hose rinse and soak steps are in how to clean a cartridge. Named cleaners and strips are in filter cleaners and test strips.

Filter cleaner and test strips

Sources

Not in sources: no current Pleatco or Filbur equivalent (Pleatco PTL55XW-F2M deactivated; FC-0465 not in the Filbur catalog); 1994 Arena/Diamante also listed under 1561-03.