Cal Spas OEM FIL11100305 spa filter (4CH-19)

Cal Spas

Replacement numbers

Unicel 4CH-19, Pleatco PSG13.5P4

Fits Cal Spas OEM FIL11100305.

Diameter 4-5/8" (117 mm)Length 4-5/8" (117 mm)13 sq ft

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Unicel4CH-19
PleatcoPSG13.5P4
FilburFC-0122
Topmolded cone handle
Bottom1-1/2” male thread/MPT
Ø 4-5/8" (117 mm)4-5/8" (117 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. 13 sq ft media.

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For Cal Spas, 4CH-19 cartridge (OEM FIL11100305) sits in Cal Spas. The cross-reference prints OEM FIL11100305; Unicel 4CH-19; Pleatco PSG13.5P4; Filbur FC-0122. 4-5/8" across, 4-5/8" long, top molded cone handle, bottom 1-1/2” male thread/MPT, 13 sq ft.

Catalog note for FIL11100305: Unicel: verify thread diameter.

4CH-19 is easy to confuse on the Cal Spas table. 4CH-252 differs by Unicel 4CH-252, Pleatco PMA20-F2M, no Filbur number, 8" long, bottom 2” male thread/MPT, 25 sq ft, OEM FIL11100303, note says Unicel: Cal Spa original has 4-3/4" OD. 5CH-502 differs by Unicel 5CH-502, Pleatco PPM50SC-F2M, Filbur FC-0195, 5-3/16" diameter, 12-1/2" long, top bar handle, bottom 2” male thread/MPT, 50 sq ft, OEM FIL11100202, note says Unicel prints OEM FIL11100202 on its own line between 5CH-502 and 5CH-752. Two Cal Spas parts retailers resolve it: Hot Tub Outpost lists Cal Spas FIL11100202 as a 50 sq ft cartridge, 12-1/2" long with a handle top and 2" MPT bottom, that replaces FIL11100200 and FIL11100201 and crosses to Unicel 5CH-502 and Pleatco PPM50SC-F2M; Wizard of Spas lists FIL11100202 (and FIL11100201) as the Cal Spas 50 sq ft cartridge with Filbur FC-0195M. Hot Tub Outpost prints the diameter as 5-1/8" (Unicel and Filbur: 5-3/16") and gives the Filbur number as FC-0196, which the Filbur catalog assigns to the 35 sq ft 5CH-352; the Filbur match shown here is the catalog's own FC-0195..

Left blank on purpose: no model/model-year fitment in sources.

Source locations for this Cal Spas row: Unicel 2026 Replacement Guide on 4CH-19 (OEM cross reference (Cal Spas section), PDF p.30 (printed p.26); spec table PDF p.6 (printed p.2)). Pleatco 2023 Catalog on 4CH-19 (Unicel-to-Pleatco cross reference, PDF p.47). Filbur Catalog & Reference Guide on 4CH-19 (Unicel-to-Filbur reverse cross reference, printed p.65 (PDF p.33)).

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.

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All 9 Cal Spas spa filters

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Cleaner and test strips

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Filter cleaner and test strips

Sources

Not in sources: no model/model-year fitment in sources.