Most customers prefer to replace filters proactively to maintain PRISTINEHYDRO water quality standards rather than wait for complete filter component degradation. Average Service Life is based on “normal” usage and average feed water quality. Actual filter life will vary with the frequency of use, total volume produced, and, most importantly, source water quality. If you are a heavy user or your water supply is of below-average quality, you may need to replace filters more frequently. We recommend periodically checking your system’s output water TDS and regularly replacing filters to maintain high system performance. Click Here to view our recommended Filter Replacement schedule by Water Revival System type. You can purchase your specific replacement filters on our Website.