Quote Originally Posted by sailork
Even if it were only 60 gpm that's one gallon per second.
This is true except that you need to divide this rate by the number of intakes which is typically 3 -- two floor drains and one skimmer. So that is still a speedy 1 gallon every 3 seconds so you are right that you wouldn't pour it that fast.

You probably couldn't pour it in much faster than one gallon over 10 seconds and more likely over 15 seconds so that's 1/5th of a 50/50 mixture which is certainly more diluted and reduces the pH increase by about log10(1/5) = 0.7

When this is in the water stream, it is at this elevated pH and hits your filter wherever it is entering your filter. I agree that by the time it spreads around your filter, it's not a problem, but it's that first area of exposure that was of concern. Remember, I was only asking the question, not at all sure that it was a problem.

Anyway, given how most people probably pour more slowly, putting it into the skimmer is probably OK, at least for bleach. For the liquid chlorine at pH 13, that's a little riskier.

Richard