what kind of grow are you running? Hempy grows require quite a bit more water as they should always be 15% or so run-off.
I run soil and 3 gal and 5 gallon. If I want them to be dry in 2-3 days I only water/feed 1 liter or so, maybe 2 liters when they are putting on weight. I do run water to run-off every few weeks.