Originally Posted by K1W1
... we tested every 4 hours manually for chlorine content. (This was with a hand held HACH chlorine analyser and reagent sachets)
With fewer people using chlorine as a bactericide this can be a problem for the ones who use something else such as UV. On ships where we didn't chlorinate, we didn't really have any thing to test. All we could do is make sure the evap temps were correct, the chlorides were down and the UV lights were working. But we made water almost constantly when well offshore because we didn't have much more storage than a large yacht so holding it for testing was a luxury that didn't exist.
We didn't have to worry about giving 3000 passengers the runs either.
On a fish factory ship we had two evaporators the size of locomotives plus a pair of standard 12000 gpd evaps for potable water and chlorinated everything. The factory techs had their own chlorinators and ran full lab tests on their water constantly plus kept amazing records since they were making a food product. We had a chlorine injector in the engine room for the potable water and used the little sachet things to check throughout the accommodation and galley to make sure the residual was correct.
While I appreciate the need to make sure crew and guests aren't reduced to getting their drinking water from a rain barrel, I can't help but to think this water testing onboard yachts thing is another of those solutions looking for a problem.