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Hot Spring OEM 1642301-1 spa filter (C-6355)

Listed for: Hot Spring Limelight — unverified

Source note: Unicel spec note: original is 6-3/8" OD

How to confirm this is your filter

Pull your current cartridge and measure it end to end, including any handle, and across the widest point of the pleats. This cartridge measures 6" in diameter and 14" long, with a 1-15/16" / open on top and a 1-15/16" / open on the bottom. The bottom fitting matters most: a cartridge with the right diameter but the wrong thread or open-end size will not seal in the filter housing, letting unfiltered water bypass the media.

The 75 sq ft rating describes the pleated media area. Hot Spring housings are designed around a particular cartridge, so choose a replacement with the same size and fittings rather than a larger area rating. We did not find a Pleatco equivalent for C-6355 in the Pleatco 2023 cross-reference, so search by the Unicel or OEM number. Hot Spring has used 2 OEM numbers for this cartridge; any of them should map to the same replacement.

Similar-diameter Hot Spring cartridges

• C-6330 cartridge (OEM 31489) — 6" × 10-1/2"
• C-6430 cartridge (OEM 31489) — 6" × 10-1/2"
• C-6350 cartridge (OEM 1642301-1) — 6" × 14"
• C-6433 cartridge (OEM 31250) — 6" × 9"

⚠ Unverified / possible conflict: this row has not been fully confirmed against a second source. Gaps: no Pleatco equivalent found in Pleatco 2023 xref p.43; no Filbur equivalent sourced; no model-year range in source; CONFLICT/related: Pleatco catalog p.26 lists OEM 1642301-1 as PWK35B (6-3/8" x 14", 35 sq ft) and PWK70B (70 sq ft) - not cross-referenced to Unicel; verify. Measure your old cartridge before ordering.

Sources

• Unicel 2026 Replacement Guide — OEM Cross Reference, PDF p.38; spec table PDF p.11 (PDF)