how do you dispose of your used resin? do you dispose of it in a safe manner and have waste transfer paperwork for this? if you dont have it this will be classes as a non conformance most likely.
thois could be a question during an audit. I ama qualified iso internal auditor and done load sof it in my last company.
Do you have trainign records?
TDS readings daily recorded?
H&S policy
best you write up a quality manual plus integrated managemtn system and devis ean audit program. Oh yeah you cannot udit yourself as that is not allowed. you either send someone on an iso internal auditing course to be able to do this or you hire someone in to go over your systems and procedures.
for everything you do within your organisation you must have a SOP standard operating procedure. you must have a pricdeure for things such as filling your tank and how it is done, ho you test water, how you clenaa window, what sytems you have in place for non conformances etc etc etc etc
i could go on all day mate.