Top secret something like that
They want the water tested for legionella bacteria that could form in the heater on the system then go airborn when the windows are being cleaned
Just a manager who has swollowed the whole health and safety manual
That must be really frustrating as well though. Because i could be completely wrong with this but legionella is based on water being stagnate and warm/hot.
If your warming water via a gas heater or a diesel heater then that doesnt apply. If like me water is being heated over night in a static van then again its not static for long enough for it to grow and certainly not whilst in transit all day.
Sometimes H&S really frustrates me. But i suppose better to be save than sorry
On the other hand, someones post on tds quality for solar panels is understandable. But both of these scenarios dont require them to look into your van nor require a van fittes system compared to someone who filters into a storage tank and transfers said water into a tank in the van.
Both tanks can be caged and all other equipment can be tidied in the same mannar.