Dimension One Spas OEM 1561-01 spa filter (C-7335)

Dimension One Spas (SpaBerry)

Replacement numbers

Unicel C-7335, Filbur FC-3058

Fits Dimension One Spas OEM 1561-01.

Diameter 7-1/8" (181 mm)Length 5-7/8" (149 mm)35 sq ft

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UnicelC-7335
Pleatconot found in source
FilburFC-3058
Topclosed w/ Y stand-offs
Bottom2" (51 mm) / open w/ twist lock
Ø 7-1/8" (181 mm)5-7/8" (149 mm)Side view · end views belowTopBottom
Top: closed w/ Y stand-offs
Bottom: 2" (51 mm) / open w/ twist lock
Drawn to scale from the listed diameter and length and open-end sizes. Handles, threads and closed ends are drawn as symbols, not to scale. 35 sq ft media.

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Dimension One Spas (SpaBerry) is the group name on the Dimension One Spas row C-7335 cartridge (OEM 1561-01). Match these numbers: OEM 1561-01; Unicel C-7335; Filbur FC-3058. 7-1/8" across, 5-7/8" long, top closed w/ Y stand-offs, bottom 2" / open w/ twist lock, 35 sq ft.

Catalog note for 1561-01: Two spa retailers (Leisure Time Inc. and Enjoy Spa Pool) give the Dimension One OEM number as 1561-01 for the SpaBerry, with the same size, fittings and 35 sq ft as Unicel. Filbur calls FC-3058 "SpaBerry 25" in one table and "Spa Berry 35" in another, and prints the length as 5-1/8" against Unicel's and both retailers' 5-7/8"; its sq ft column says 35. Filbur prints N/A for Pleatco.

C-7335 is easy to confuse on the Dimension One Spas table. C-7367 differs by Unicel C-7367, Pleatco PDO75-2000, Filbur FC-3059, 10-1/2" long, 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".. 7CH-552 differs by Unicel 7CH-552, no Filbur number, 7" diameter, 10-1/2" long, top semi-circular handle, bottom 2” male thread/MPT, 52 sq ft, OEM 1561-10, note says 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..

Pleatco does not have a number on this row. Search 1561-01 or the Dimension One Spas part you pulled out of the spa.

Left blank on purpose: no Pleatco equivalent; Filbur length 5-1/8" vs 5-7/8" (Unicel and two retailers); no Dimension One document found giving 1561-01; no model-year fitment beyond SpaBerry in sources. Promoted 2026-11-03: OEM 1561-01 from two retailer listings that agree with Unicel's size, fittings and area.

Where those figures are printed: Unicel 2026 Replacement Guide on C-7335 (OEM cross reference (Dimension One Spas section), PDF p.34 (printed p.30); spec table PDF p.18 (printed p.14)). Filbur Catalog & Reference Guide on C-7335 (Product by Pool/Spa Manufacturer (OEM), Dimension One Spas, printed p.33 (PDF p.17)). Leisure Time Inc. (spa dealer listing) on C-7335 (Unicel C-7335 product page (fetched 2026-11-03): replaces Dimension One Spas OEM 1561-01 (SpaBerry); 7-1/8" x 5-7/8", closed top w/ Y stand-offs, 2" open twist-lock bottom, 207 pleats, 3 oz, 35 sq ft; Filbur FC-3058). Enjoy Spa Pool (retailer listing) on C-7335 (Filter cartridge 35 sq ft Dimension One (C-7335), fetched 2026-11-03: Spa Berry; 7-1/8" x 5-7/8"; closed top; 2" open twist-lock bottom; 35 sq ft; 3 oz; OEM 1561-01; Unicel C-7335; Filbur FC-3058).

If you know the Dimension One Spas model and not the part number, use the Dimension One Spas filter by model and year lookup.

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

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Filter cleaner and test strips

Sources

Not in sources: no Pleatco equivalent; Filbur length 5-1/8" vs 5-7/8" (Unicel and two retailers); no Dimension One document found giving 1561-01; no model-year fitment beyond SpaBerry in sources. Promoted 2026-11-03: OEM 1561-01 from two retailer listings that agree with Unicel's size, fittings and area.