Hi Rpl106,

Welcome to the IFSQN forums.
I think the problem is usually getting access to sample the rinse water without contaminating the sample.
Normally I prefer to use Peroxyacetic Acid (PAA) for disinfection as it can be used in the final rinse without the need for further rinsing unless the product falls under an organic category where a final rinse of potable water is required.
So, this can be done 2 ways:
1. Sample the Final Rinse with PAA but neutralise it before plating and compare with Water Supply (Control)
2. Rinse with Potable Water Supply after the Final PAA Rinse and sample that and compare with Water Supply (Control)
Also consider if the water supply is chlorinated, you most likely need to neutralise that as well when sampling.
Kind regards,
Tony
Edited by Tony-C, 04 December 2020 - 05:18 AM.
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