a) The WD manufacturer shall specify the means which shall be used to ensure that the disinfectant solution has retained the required anti-microbial activity. These means shall be based on validation studies, which would normally be carried out by the disinfectant manufacturer, to determine a suitable parameter, or parameters, which may be monitored to indicate the anti-microbial activity of the disinfectant. Suitable parameters may include e. g. pH, stability, the concentration of the active ingredient and adjuvants that may also affect performance.
NOTE Minor changes in formulation of the disinfectant can have a significant effect on storage life, anti-microbial activity etc..
b) The WD manufacturer shall recommend to the user the maximum period or number of operating cycles for which the disinfectant may be used. This shall be based on validated experimental data.
c) When validated use conditions (maximum period or number of operating cycles) are exceeded, the automatic controller shall operate an audible and visible alarm and prevent the use of the operating cycle until chemicals are changed.
The WD manufacturer should recommend that the user monitor the disinfectant concentration using a chemical indicator specific for the disinfectant to show that the disinfectant is at or above the minimum recommended concentration.
a) The WD manufacturer shall specify the means which shall be used to ensure that the disinfectant solution has retained the required anti-microbial activity. These means shall be based on validation studies, which would normally be carried out by the disinfectant manufacturer, to determine a suitable parameter, or parameters, which may be monitored to indicate the anti-microbial activity of the disinfectant. Suitable parameters may include e. g. pH, stability, the concentration of the active ingredient and adjuvants that may also affect performance.NOTE Minor changes in formulation of the disinfectant can have a significant effect on storage life, anti-microbial activity etc..b) The WD manufacturer shall recommend to the user the maximum period or number of operating cycles for which the disinfectant may be used. This shall be based on validated experimental data.c) When validated use conditions (maximum period or number of operating cycles) are exceeded, the automatic controller shall operate an audible and visible alarm and prevent the use of the operating cycle until chemicals are changed.The WD manufacturer should recommend that the user monitor the disinfectant concentration using a chemical indicator specific for the disinfectant to show that the disinfectant is at or above the minimum recommended concentration.
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