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Systems certified for cyst reduction may be used on disinfected waters that may contain filterable cysts. CAUTION: Filter must be protected against freezing, which can cause cracking of the filter and water leakage. CAUTION: The rubber O-ring provides the water-tight seal between the cap and the bottom of the housing. It is important that the O-ring be properly seated in the groove below the threads of the housing or a water leak could occur. CAUTION: Because of the product’s limited service lif