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Replace the QS-001 sleeve immediately when you observe: 1) Any cracks, chips, or breaks in the glass (even hairline cracks require immediate replacement). 2) Cloudy appearance or white mineral film that persists after thorough cleaning with acid solutions. 3) Visible scratches, etching, or pitting on the glass surface that cannot be buffed out. 4) The sleeve has been in service for 24-36 months (standard replacement interval). 5) Brown, yellow, or dark staining that cannot be removed with cleaning solutions. 6) Loss of transparency even after proper cleaning attempts. 7) Any deformation or changes to the sleeve's shape. When any of these conditions are present, UV light transmission is reduced, meaning your water may not be adequately disinfected against harmful microorganisms. For safety, replace the sleeve promptly. Order replacements at https://espwaterproducts.com/products/viqua-sterilight-qs-001-quartz-sleeve-for-s1q-pa-and-ssm-14-uv-systems