Your assuming that your salinity divertor is 'fool proof'??

You may be correct because, while using the product water as it is being
delivered, you would stand a better chance of noticing your coffee is a bit
salty.

My set up will deliver the product water to the tank fill manifold..

I may rethink this since I could fill a tank with bad water and never know
it.

I was onboard a friends boat and he had the product water line coming to his
galley sinks where it ran down the drain until he took a final "taste"
sample.. If it was good, he turned a 3 way valve that sent it to the tanks.

My HRO system has a remote control/indicator panel with both audible and
visual alarms to indicate any fault in the system or product water.. I
haven't installed it yet, seems to complicate the system too much.

I kinda like my friends simple method. KISS..

Steve
s/v Good Intentions