Rinsing between washing and disinfection shall be used to reduce the concentration of residues (process chemicals and soiling including microbial contamination) to a level established as not exceeding that which would impair the efficacy of the disinfection process.
Rinsing shall take place between washing and disinfection unless it can be demonstrated that:
a) there is no reaction between incompatible process chemicals being used for each of these phases, and
b) there is no adverse reaction between suspended or residual soiling and the disinfectant.
The interaction between the disinfectant and residual soiling shall be tested under conditions in which soiling is at or above the maximum level that may occur in use and the disinfectant is at or below the minimum specified in-use concentration.
The rinse water quality shall be specified by the WD manufacturer.
This should be of, at least, potable quality.