I agree that a little more guidance on the stability of Hydrolyte would be welcome. On the other hand I understand that the stability is totally dependent on environmental conditions. That is why PCTL recommends testing your own product.
From what i gather, a sealed bottle stored in a cool place is probably still active (but not a peak potency) up to 6 months. Opened bottles should be used within 30 days.
I’ve seen better explanations of stability from the Pathisol website than the US website.
Note, Ace said that the 600ppm was LESS stable. It is also a reasonable assumption that the loss of activity is not linear over time, but rather some logarithmic decline. So 600ppm probably becomes 500ppm more quickly than 500ppm becomes 400ppm etc. In other words there is likely diminishing returns for creating stronger solutions. Why the UK went for 600 and the PCTL for 500, I don’t know.
Note, there are other manufacturers out there that sell products with half the concentration and many studies have shown effectiveness in particular applications below 100ppm.
Time is a big factor in effectiveness. Something soaking in a low concentration may be very effective. On the other hand misting requires a higher concentration to make sure reactions can take place before evaporation and breakdown of the HOCl.
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