Unicel's C-4327AM delivers 27.5 square feet of filtration in a 4000 Series spa cartridge built with antimicrobial-treated 3 oz. Reemay 2033 media. With 158 precision-formed pleats packed into an 11 5/8" profile, this cartridge maximizes surface area for thorough debris capture while the antimicrobial treatment inhibits bacteria, mold, and mildew growth directly on the filter media — keeping pleats cleaner between wash cycles and extending service life. ⚠️ IMPORTANT: ADAPTER REQUIRED — NOT INCLUDED This cartridge uses an open w/ slots bottom cap that locks onto a reusable tabbed thread adapter seated in your spa's skim well. This adapter is not furnished with the cartridge — it transfers from your existing filter setup. Before ordering, confirm your adapter is present and in good condition. If the adapter is missing, you will not be able to install this filter. Specifications Filter Area 27.5 sq. ft. Length 11 5/8" Outer Diameter 4 5/8" Top Inner Diameter N/A Bottom Inner Diameter 1 7/8" Material 3 oz. Reemay 2033 w/ antimicrobial Pleat Count 158 Top Cap: molded cone handle Bottom Cap: open w/ slots Note from Unicel: Requires existing tabbed thread adapter in skim well (not furnished). Manufactured with antimicrobial filter media. Fits Into: OEM Brand Product Name Part Number Notes Saratoga Spas — 20242-238 (alt: 74452) Verify fit by dimensions; part number may vary by model year Unicel (Standard Media) — C-4327 Non-antimicrobial version — identical dimensions (This is not an exhaustive list.) Pro Tip: The antimicrobial treatment in this cartridge inhibits bacteria, mold, and mildew growth on the filter media itself — it does not sanitize spa water or reduce the need for chlorine, bromine, or other water care products. Before installing, confirm your tabbed thread adapter is seated securely in the skim well. The molded cone handle makes removal straightforward — twist, lift, and rinse. Also known as: C4327AM
