The Pentair BioShield Ballast (523032) is the OEM replacement previous-generation ballast for the Pentair BioShield UV disinfection system, covering the 50W, 80W, and 120W models. ⚠️ IMPORTANT: PREVIOUS GENERATION BALLAST ONLY Part 523032 fits previous-generation BioShield UV systems only. If your system is a current-generation unit, this ballast will not be the correct replacement. Verify the generation of your BioShield system against the part number on the original ballast before ordering. The ballast regulates the electrical current supplied to the UV lamp within the BioShield system, maintaining the stable arc voltage required for consistent UV output. A failed or degraded ballast results in reduced UV intensity or complete lamp failure, compromising the system's ability to disinfect water. This single replacement ballast (sold individually) restores full electrical function to the UV chamber across all three wattage variants of the previous-generation BioShield platform. Specifications Pentair Part Number 523032 Part Name BioShield Ballast (Previous Generation) Compatible Wattages 50W, 80W, and 120W (previous generation only) Quantity Included Each (1) Fits Into Brand Equipment Line Model / Part Number Notes Pentair BioShield UV System — BioShield Series 522635 Previous generation ballast for 50W, 80W, and 120W models only Pentair BioShield UV System — BioShield Series 522636 Previous generation ballast for 50W, 80W, and 120W models only Pentair BioShield UV System — BioShield Series 522637 Previous generation ballast for 50W, 80W, and 120W models only Compatibility is based on Pentair parts documentation and available OEM records. This is not an exhaustive list. For certainty, verify the part number in your equipment's manual or on the original part itself before ordering. Pro Tip Before ordering, locate the part number printed or labeled on your existing ballast and confirm it matches 523032. The BioShield platform spans multiple generations, and the ballast for current-generation units is a different part number. If your original ballast carries a different number, check your equipment's service manual or contact Pentair to identify the correct current replacement before purchasing. ---
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