This was the only time I used the copper based algaecide, and my last. I've been using some that I bought from Sam's Club that the main ingrediant is diemethyl benzol chloride (I read it, but doubt if I spelled to correct). Prior to that was the Bioguard algaecide and Banish. I'm not satisfied with any of the products since I can't keep the algae out of my pool.
According to the bleach calculator, I should add 2-1/2 gallons to raise my FC over 20ppm.