Algae is driving me nuts

[chem geek]

It's the combination of high PolyQuat concentration AND high chlorine concentration that leads to rapid consumption. If either is at lower concentration, then their mutual reaction and destruction of chlorine is slower -- proportional to the product of the two concentrations.

So unless your chlorine was at a higher shock level, you might not notice the slower reaction.

[CarlD]

...

So unless your chlorine was at a higher shock level, you might not notice the slower reaction.

I did not know that. Good to know!