Volume is irrelevant with concentrations. It only matters for chemical quantity additions.
Sent from my SCH-I545 using Tapatalk
Sent from my SCH-I545 using Tapatalk
At least 30 minutes with the pump on. If you really want to be sure it's well mixed and your reading is accurate, make a lap around the pool with the brush. All the crosscurrents will get it mixed.After adding acid, how long should I wait to retest?
Where can I get a speed stir, does it have a propritory name?
You need a good test kit. Right now you are trying to drive across the country without a GPS and a map from 1947.