You need to do a test and some math to figure out what GPM your pump is actually putting out, and to figure out how much chemical your injector is pulling.
Once you know that, you can calculate the rest.
You can also use a batch mix calculator to figure out your strength before downstreaming.
640 ounces in 5 gallons
384 ounces are 12.5% bleach
649/384=1.69
12.5/1.69=7.396% (that is what’s in your 5 gallon bucket before downstreaming)
7.396/11=0.672% being put down on the concrete. (take what’s in your bucket and divide by the injector ratio 10:1=11)
