(SW Inadequate inactivation Based upon design or calculations made operation in this (CT)*. sanitary survey using The conservative water values, treatment the system required level of operation virus > 3 inactivation and/ or logs? is design not does achieved by not provide for the adequate time the water inactivation reaches of the first user. Giardia The system The lamblia. must ensure SWTR requires adequate that inactivation; water the systems disinfection achieve at least profiling 99.9% (3-log) spreadsheet sent to the removal and/or system should inactivation be of used weekly Giardia for one year cysts lamblia to document and 99.99% (4-log) adequate inactivation. removal If and/or the system is inactivation unable to of achieve viruses. the As required documented 4 log in this sanitary inactivation by adjusting survey, the the filtration flow rate or system chlorine when properly residual, it is possible operated that does modifications not achieve to the the required system design reduction will of be Giardia; necessary. therefore, the system must achieve additional
Based upon calculations made in this sanitary survey using conservative values, the required level of virus inactivation is not achieved by the time the water reaches the first user. The system must ensure adequate inactivation; the disinfection profiling spreadsheet sent to the system should be used weekly for one year to document adequate inactivation. If the system is unable to achieve the required 4 log inactivation by adjusting the flow rate or chlorine residual, it is possible that modifications to the system design will be necessary. (SW > 3 logs? Inadequate inactivation design or operation (CT)*. The water treatment system operation and/ or design does not provide for adequate inactivation of Giardia lamblia. The SWTR requires that water systems achieve at least 99.9% (3-log) removal and/or inactivation of Giardia lamblia cysts and 99.99% (4-log) removal and/or inactivation of viruses. As documented in this sanitary survey, the filtration system when properly operated does not achieve the required reduction of Giardia; therefore, the system must achieve additional