The schedule on the bottle is for once a week feedings general hydroponics told me. The one I followed was for twice a week feedings. My 3 gallon fabric pots dried out every 3 days.This is the chart I have been following with just the 3 part. https://gh.growgh.com/docs/Feedcharts/GH_FloraSeries-DTW_03216am.pdf
My well water ph is 8.0 and with fert added it drops to 6.5 ish. I would then add acid until it was at around 5.8. It was plant ph down from Canadian tire.