By default, the percentage is taken from the reference point (the existing situation), not from the alteration, nor from the end result, unless so specified.
In cases where no deviations are specified, like on the Sentinel website, the default would apply. Another example would be that not every road in a built up area has "30" signs at every corner.
Oh dear, oh dear.
There's a default? There must be, BG man hath decreed it so. So, what is the default? Where is the default specified?
Is it the concentration of the inhibitor in percent, although you cannot directly measure the concentration of the inhibitor? Or the concentration of the active ingredients in per cent, although the concentration will be of the order of 0.025%?
[Another standard thing about percentages is that it is measured in percents, not in ppm.
Get away! Well, I never!
Per centages are in parts per hundred, parts per million are in parts per million.
Have you finished with the patronizing yet or would you like to do some more?
As the product does not alter regularly, there is no need to go into extensive measurements of individual components, which would bring the use of the product outside the consumer market.
Wrong. It contains a pH buffer which will neutralize a limited amount of acid compounds, i.e., acid flux in a new system or acidic cleaning chemicals. The acidic residues in a new or amended system can overwhelm the pH buffer, making the water acidic and causing galvanic corrosion. The pH will alter as flux resdiues are dissolved or neutralized. You do not know if the inhibitor dose has been adequate unless you initially monitor the pH. The concentration of the oxygen scavenger will also change as oxygen enters the system.
Maybe I am suffering from an early onset of Alzheimer's, but I can't recall determining the dose of sentinel being part of my gas-training. Did you get any instruction/questions about how to use Sentinel in your gas-training?.
I'm an Engineer, not a gas technician. I did study corroison a little, but it's so long ago I can't remember it. Most of what I know came from work on projects involving water treatment (i.e., softening, RO, de-ionized water, steam boiler, MTHW and LTHW systems).
Maybe you could tell us where you studied water treatment, if it's not part of the BG training scheme? Maybe you could also recognize that gas training does not make you into a "heating engineer", despite what BG tell the gullible public.