Howdy Caper, I am currently (harvesting now) on my eighth hydroponic grow. I have used other nutrient lines, but now, I use the GH MaxiGrow and MaxiBloom line (with supplements) and I have had very good results by following the GH feeding schedule posted on their web site. There are schedules for all of the different methods and nutrient lines. I feed the recommended strength once a week and at mid week, I top off the reservoirs with pH'ed water. I completely drain off the reservoir at the end of the week and start over.
Good luck with Your growing.