The Unicel 8CH-502 delivers 50 square feet of filtration capacity in a compact wide-format design — 7 1/4" long with an 8 1/2" outer diameter — purpose-built for Vita Spa filter housings. Engineered with 258 precision pleats of 3 oz. Reemay 2033 spunbond polyester media and a 2" MPT threaded bottom connection, the 8CH-502 is the direct replacement for Vita Spas OEM part number PVT 50WH. ⚠️ IMPORTANT: Remove Pad Adapter Before Installing Some Vita Spa filter canisters include a flat, non-threaded pad adapter at the bottom of the housing — used for older drop-in style filters. To install the 8CH-502, unscrew and remove this adapter plate first to expose the 2" female threads in the housing. The 8CH-502's MPT bottom threads directly into those exposed fittings. Applicable to all 2006 and later models, and earlier models with slotted bottoms once the pad adapter is removed. ⚠️ IMPORTANT: Full Filter Service May Require 2 Cartridges Several larger Vita Spa models — including the Joli and Nuage — use a dual-cartridge system requiring two 8CH-502 filters for a complete service. Replacing only one while leaving a worn cartridge in place reduces overall filtration efficiency. Add 2 units to your cart if your spa model requires a pair. Specifications Filter Area 50 sq. ft. Length 7 1/4" Outer Diameter 8 1/2" Material 3 oz. Reemay 2033 Pleat Count 258 Top Cap: v-groove semi-circular handle Bottom Cap: 2" male thread/MPT Fits into: OEM Brand Product Name Part Number Notes Vita Spas 50 sq. ft. Top Load / Front Access PVT 50WH Remove pad adapter (if present) before threading MPT into suction fitting. 2006+ models and earlier slotted-bottom models with pad adapter removed. (This is not an exhaustive list. Verify compatibility before purchasing.) Pro Tip: Confirm your exact filter dimensions before ordering — measure the length and outer diameter of your existing cartridge and compare to the 7 1/4" × 8 1/2" specs above. The v-groove semi-circular handle and 2" MPT bottom threading are the two key identifiers that distinguish the 8CH-502 from other 50 sq. ft. spa cartridges with different end cap configurations.
