Dimension One Spas OEM 1561-06 spa filter (4CH-65)

Dimension One Spas

Replacement numbers

Unicel 4CH-65

Fits Dimension One Spas OEM 1561-06, 1561-07.

Diameter 4-5/8" (117 mm)Length 19-5/8" (498 mm)65 sq ft

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Unicel4CH-65
Pleatconot found in source
Filburnot found in Filbur catalog
Topmolded cone handle
Bottom1-1/2” male thread/MPT
Ø 4-5/8" (117 mm)19-5/8" (498 mm)Side view · end views belowTopBottom
Top: molded cone handle
Bottom: 1-1/2” male thread/MPT
Drawn to scale from the listed diameter and length. Handles, threads and closed ends are drawn as symbols, not to scale. 65 sq ft media.

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Dimension One Spas files this cartridge as 4CH-65 cartridge (OEM 1561-06), in the Dimension One Spas group. Numbers on the row: OEM 1561-06, 1561-07; Unicel 4CH-65. 4-5/8" across, 19-5/8" long, top molded cone handle, bottom 1-1/2” male thread/MPT, 65 sq ft.

1561-06 carries this note from the catalogs: Unicel lists both 1561-06 (65 sq ft) and 1561-07 (80 sq ft) against 4CH-65 and notes the original was 23-3/4" overall. Two retailers (SpaStore and Hot Tub Outpost) tie OEM 1561-06 and 1561-07 to Unicel 4CH-65 at 4-5/8" x 19-5/8" with a handle top and 1-1/2" MPT bottom, 65 sq ft. They also name Pleatco PTL65H-P4 / PTL65 and Filbur FC-0171, but neither number appears in the Pleatco 2023 or Filbur catalogs, so they are not shown as equivalents.

4CH-65 is easy to confuse on the Dimension One Spas table. 4CH-940 differs by Unicel 4CH-940, Pleatco PDO-UF40P2, Filbur FC-0177, 15" long, top semi-circular handle, bottom 1-1/4" SAE thread, 40 sq ft, OEM 1561-13. 4CH-50 differs by Unicel 4CH-50, Pleatco PTL50P-4, Filbur FC-0151, 14-3/4" long, 50 sq ft, OEM 1561-05.

Pleatco and Filbur do not have a number on this row. Search 1561-06 or the Dimension One Spas part you pulled out of the spa.

Left blank on purpose: no Pleatco or Filbur equivalent in either catalog; 1561-07 (80 sq ft) maps to a 65 sq ft replacement; no model/model-year fitment in sources.

Source locations for this Dimension One Spas row: Unicel 2026 Replacement Guide on 4CH-65 (OEM cross reference (Dimension One Spas section), PDF p.33 (printed p.29); spec table PDF p.7 (printed p.3)). SpaStore.com (retailer) on 4CH-65 (AK-9008: OEM 1561-06, 1561-07; Unicel 4CH-65; Pleatco PTL65H-P4; Filbur FC-0171; 4-5/8" x 19-5/8", handle, 1-1/2" MPT, 65 sq ft). Hot Tub Outpost (retailer) on 4CH-65 (AK-9008 for Dimension One: lists 1561-06, 4CH-65, FC-0171, PTL65; 4-5/8" x 19-5/8", 1-1/2" MPT, molded cone handle, 65 sq ft).

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

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 Pleatco or Filbur equivalent in either catalog; 1561-07 (80 sq ft) maps to a 65 sq ft replacement; no model/model-year fitment in sources.