Many of the these dose changes occur as incoming water changes, and can happen moment to moment, and can happen many times in a day. Hospitals and health facilities are on priority notification, but with the way governments are being required to cut back on qualified people, phone calls about non essential matters that interrupt critical action can be harmful to the health of the population.
Because I was the only fish keeper where I worked, I was funneled all fish calls, I never took a call, or went to take a sample, where it wasn't a fish keeper error. 98% of the time it was new tank syndrome, and the tax payer ended up paying the bill for man hours and hundreds $ in lab tests that could have been avoided. And even after test results were verified, the customers didn't believe them.
All an aquarist has to do, is google their cities EPA required water quality report, and the answers are all there. Dosage of chlorine/chloramine, nitrate levels, pH, etc.
I read Ryan's, and one from England today in a matter of minutes.